forces and motion 7.P.1.2 [2653744]
Student
Class
Date
1. The diagram shows forces acting on a wagon.
A wagon is pulled to the right using a force of 20 N and to the left using a force of 30 N.
What is the net force on the wagon?
A. 10 newtons to the left
B. 50 newtons to the left
C. 10 newtons to the right
D. 50 newtons to the right
2. A truck traveling down a road contains two wooden boxes in the center of the bed of
the truck. One box has a mass of 25 kilograms (kg) and the second box has a mass of
100 kilograms (kg).
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• If the truck stopped suddenly, which box would MOST likely move more?
• Why would one box move more than the other?
3. Use the diagram to answer the question that follows.
Two forces act on the block of wood as shown. In which direction will the block move?
A.
B.
C.
D.
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4. A student pushes a shopping cart filled with groceries. The cart has a mass of 12
kilograms (kg). The student pushes the cart with a force of 15 newtons (N). Assuming
the ground is frictionless, how fast will the cart accelerate until the student stops
applying the force?
A.
B.
C.
D.
5. An engineer builds a model of a machine pivot. Instead of the two parts of the pivot
directly touching one another, they have ball bearings between them.
As an indication of the amount of friction in the pivot, what should the engineer
measure?
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A. the radius of the ball bearings before the pivot has been used
B. the increase in mass of the ball bearings when the pivot rotates
C. the temperature increase in the ball bearings when the pivot rotates
D. the number of ball bearings remaining after the pivot has been used
6. ¿Cuál masa está sometiendo la cantidad mayor de aceleración?
A. 1 kg fue sometido a una fuerza de 1 N
B. 1 kg fue sometido a una fuerza de 100 N
C. 100 kg fue sometido a una fuerza de 1 N
D. 100 kg fue sometido a una fuerza de 100 N
7. Two forces are applied to a wooden box as shown below.
Which statement BEST describes the effect these forces have on the box?
A. The box does not move.
B. The box moves to the right.
C. The box moves to the left.
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D. The box moves straight up.
8. The illustration below shows forces acting on a box.
What is the net force on the box if the sliding friction between the box and the floor is
5N?
A. 5N to the left
B. 8N to the right
C. 13N to the right
D. zero net force
9. ¿Cuál es la cantidad de fuerza necesaria para acelerar un objeto de 20 kg a 5 m/s2?
A. 0.25 N
B. 4 N
C. 15 N
D. 100 N
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10. The following diagrams show various forces acting on a car.
• The car in Diagram 1 is moving. Using the appropriate term balanced or
unbalanced, explain what will happen to the car when the forces are applied as shown.
• The car in Diagram 2 is at rest. Using the appropriate term balanced or unbalanced,
explain what will happen to the car when the forces are applied as shown.
• The car in Diagram 3 is at rest. Using the appropriate term balanced or unbalanced,
explain what will happen to the car when the forces are applied as shown.
• Identify what would be needed in order to balance the force in Diagram 4.
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11. Two forces act on a block as shown in the picture.
What is the net force on the block?
A. 10 N to the left
B. 10 N to the right
C. 30 N to the right
D. 30 N to the left
12. Hay una caja sobre una mesa. María y Julia empujan la caja una hacia la otra.
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Si María empuja con más fuerza que Julia, ¿en cuál dirección es MÁS probable que se
mueva la caja?
A. Norte
B. Este
C. Sur
D. Oeste
13. ¿Cuál afirmación compara MEJOR un automóvil estacionado con un automóvil que se
mueve a lo largo de una línea recta a una velocidad constante?
A. No hay fuerzas que actúan en ningún automóvil.
B. Sólo el automóvil en movimiento está siendo sometido a las fuerzas.
C. Ambos automóviles están siendo sometidos a las fuerzas equilibradas.
D. Sólo el automóvil estacionado está siendo sometido a las fuerzas equilibradas.
14. Dennis conducted an investigation on the effect of friction on a toy car. Dennis had a
ramp that he moved onto four different surfaces. During each trial, he rolled the toy
car down the ramp and measured the distance the car traveled from the bottom of the
ramp. He repeated the investigation three times on each surface. His data are shown in
the table.
Toy Car Rolling Distance
Surface
Distance
(cm)
Trial 1
Trial 2
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Wood
18
20
18
Blacktop
16
15
15
Gravel
10
10
8
Sand
8
7
6
Based on Dennis’s results, what should he conclude?
A. The toy car rolled farther on gravel than on sand
B. The toy car rolled the greatest distance on wood.
C. The toy car rolled the shortest distance on gravel.
D. The toy car rolled farther on sand than on blacktop.
15. How do forces act on a dropped object as it is falling?
A. Air resistance is pushing up on the object, while gravity is
pulling it down.
B. Air resistance is pulling down on the object, while gravity is
pushing it up.
C. Both gravity and air resistance are pulling down on the object.
D. Both gravity and air resistance are pushing up on the object.
16. Los estudiantes realizaron una investigación dejando caer una bola de dos alturas
diferentes. En la primera prueba, la bola fue dejada caer de una altura de 10 metros y
la velocidad fue medida después de 2 segundos. En la segunda prueba, la bola fue
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dejada caer de una altura de 20 metros y la velocidad fue medida después de 2
segundos. ¿Cuál de estos describe la relación entre las velocidades medidas en las dos
pruebas?
A. La velocidad en la segunda prueba será dos veces la velocidad en la primera prueba.
B. La velocidad en la primera prueba será igual como la velocidad en la segunda prueba.
C. La velocidad en la primera prueba será 10 m/s más rápida que la velocidad en la segunda
prueba.
D. La velocidad en la segunda prueba será 10 m/s más rápida que la velocidad en la primera
prueba.
17. If a book sitting on a flat table starts to move horizontally, it is MOST likely moving
because
A. a balanced force is being applied.
B. a frictional force is being exerted.
C. an unbalanced force is being applied.
D. a gravitational force is being exerted.
18. Which statement BEST describes the motion of an object that is being subjected to two
forces of equal magnitude in opposite directions?
A. The object is accelerating in the direction of the motion.
B. The object is at rest or moving at a constant velocity.
C. The object is accelerating at a rate that depends on the magnitude of the forces.
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D. The object starts from rest and then begins to move at a constant velocity.
19. Marisa and Dakota were investigating air friction. Marisa dropped a ball, a pen, a
sweatshirt, and a flat sheet of paper from the same height. Dakota recorded the amount
of time it took each object to reach the ground. Which object MOST likely took the
longest amount of time to reach the ground?
A. the pen
B. the ball
C. the sweatshirt
D. the sheet of paper
20. Cuando un transbordador espacial orbitó la Tierra y regresó a su base, una fuerza se
opuso a su movimiento. ¿Cuál es la fuente de la fuerza que se opone?
A. la fricción de la atmósfera
B. la velocidad del transbordador
C. la masa del transbordador
D. la gravedad de la Tierra
21. Rowing a boat forward requires a force that will overcome friction from water and
wind. Which factor MOST helps overcome the forces working against the boat?
A. the length of the boat
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B. the height of sides of the boat
C. the weight of the rowers in the boat
D. the number of people rowing in the boat
22. The arrows in the diagram below represent equal forces acting on balls that are resting
on a table.
Which of the balls will be accelerated if the forces are applied?
A. Ball 1
B. Ball 2
C. Ball 3
D. Ball 4
23. A skateboarder runs for a few steps and then jumps on his skateboard. His initial
applied energy carries him across a level surface for about 30 seconds. The skater
notices that he has skated a long time without ever having to push off the ground again.
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What allows the skateboarder to move so long without pushing?
A. Gravity does not act on the skater and board.
B. The texture of the skating surface is very rough.
C. Momentum increases as the length of time increases.
D. There is little friction between wheels and surface.
24. Two girls are pulling on opposite ends of a thick rope. Both girls pull on the rope with
the same force but in opposite directions. If both girls continue to pull with the same
force, what will MOST likely happen?
A. One girl will pull the other toward her.
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B. Both girls will stay in the same place.
C. Gravity will cause the rope to sag.
D. The rope will break.
25. What is the MOST reasonable explanation for why a toy car rolls farther on a wood
floor than on a thick carpet?
A. The car weighs more on the carpet.
B. The car weighs more on the floor.
C. The carpet has more resistance.
D. The floor has more traction.
26. A box is on a table. Maria and Julia push the box toward each other.
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If Maria pushes with more force than Julia, in which direction will the box MOST
likely move?
A. North
B. East
C. South
D. West
27. Un estudiante concluye que ningunas fuerzas se están aplicando a una carreta de
laboratorio que se mueve a una velocidad constante. ¿Cuál afirmación explica MEJOR
por qué la conclusión del estudiante es incorrecta?
A. La carreta debe ser sometida a una fuerza neta para continuar moviéndose a la misma
velocidad.
B. La dirección de la carreta cambia después que son aplicadas las fuerzas desequilibradas.
C. La carreta es sometida a una fuerza aplicada que cancela el efecto de la fricción.
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D. La fuerza neta en la carreta debe estar en la dirección del movimiento para superar la
fricción.
28. Rodger pushes his skateboard across a sidewalk.
If the sidewalk is level, which would MOST likely make the skateboard lose its kinetic
energy?
A. friction
B. heat
C. magnetism
D. temperature
29. ¿Cuál de estas opciones es un ejemplo de la primera ley del movimiento de Newton?
A. Una pelota de béisbol pegada con un bate de béisbol viaja más rápido que una bola de
boliche pegada con la misma fuerza.
B. Un balón de baloncesto rebota en el suelo con la misma fuerza que el suelo empuje hacia
arriba en el balón.
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C. Una persona salta a una muelle de un barco, y el barco se mueve de la muelle.
D. Una persona que está de pie en un autobús se mueve hacia atrás cuando el autobús de
repente se mueve hacia adelante.
30. ¿Cuál es un ejemplo de fuerzas equilibradas?
A. una puerta que empieza a abrirse
B. una pelota de baloncesto que es detenida
C. un camión que comienza a acelerar
D. un libro que cae de una mesa
31. Un estudiante empuja un carrito de compras lleno con comestibles. El carrito tiene una
masa de 12 kilogramos (kg). El estudiante empuja el carrito con una fuerza de 15
newton (N). Asumiendo que el suelo es sin fricción, ¿cómo de rápido acelera el carrito
hasta que el estudiante deja de aplicar la fuerza?
A.
B.
C.
D.
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32. The diagram shows two forces acting on a ball at the same time.
Which arrow represents the MOST likely direction the ball will move?
A.
B.
C.
D.
33. In a lab investigation, a student notes that two metal blocks have the same mass. Based
on this observation, if the two blocks were put on opposite sides of a balance, they
would BEST represent
A. balanced forces.
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B. unbalanced forces.
C. equal and opposite reactions.
D. objects in motion.
34. A person stands motionless on Earth’s surface on a rainy day with no wind. To that
person, which direction will the rain appear to fall?
A. vertically
B. diagonally
C. horizontally
D. circularly
35. La gravedad es una fuerza de atracción mensurable que actúa en los objetos. ¿Cuál
característica determina la gravedad de un objeto?
A. la fricción
B. la masa
C. la tensión
D. el peso
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36. The arrows indicate the direction a 40-mile-per-hour wind is blowing. Which shows the
wind direction that would slow a moving car the MOST?
A.
B.
C.
D.
37. A student pushes a box with a force of 15 newtons (N) to make it slide across the floor.
Once the box starts moving, a frictional force of 5 N acts upon it.
If the student continues to push the box with a force of 15 N, what will happen to the
box?
A. The box will stop moving forward.
B. The box will move forward at a steady speed.
C. The box will move forward at a decreased speed.
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D. The box will move forward at an increasing speed.
38. Un nadador nada a través de una piscina, y al extremo de la piscina se da la vuelta y
empuja de la pared con los pies. ¿Cuál opción describe un par de fuerzas de acciónreacción durante el empuje?
A. la fuerza de sus pies en la pared y la fuerza de la pared en sus pies
B. la fuerza de la gravedad en su cuerpo y la fuerza de sus pies en la pared
C. la fuerza de la gravedad en su cuerpo y la fuerza de la pared en sus pies
D. la fuerza de sus pies en la pared y la fuerza del agua en su frente
39. Alice lifted 5 bricks a height of 4 meters (m) each. Each brick weighed 110 newtons (N).
What was the total amount of work for Alice to move the bricks?
A. 20 joules
B. 440 joules
C. 550 joules
D. 2200 joules
40. Un estudiante que camina rápidamente mientras que carga una naranja en su bandeja
del almuerzo se detiene bruscamente. La naranja MÁS probablemente rodará de la
bandeja debido a
A. la inercia de la naranja.
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B. la fuerza centrípeta de la naranja.
C. la fricción que actúa sobre la naranja.
D. las fuerzas equilibradas que actúan sobre la naranja.
41. A student pushed a toy truck on a flat surface that was 10 meters long. At the end of
the surface was a wall. The first time he pushed the toy truck, it traveled 4 meters.
How far would the toy truck travel if friction was eliminated?
A. the total distance of the flat surface
B. less than the original distance
C. twice the original distance
D. the same distance
42. Un estudiante mide la aceleración de un bloque de piedra en una superficie plana
cuando sobre él actúa una fuerza conocida. ¿Qué información adicional es necesaria
para calcular con precisión la masa del bloque?
A. la densidad del bloque
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B. la cantidad de fricción
C. la masa de la superficie
D. la dirección del movimiento
43. As an object falls, air resistance gradually increases until it is equal with the pull of
gravity. This effect is called
A. final velocity.
B. initial velocity.
C. escape velocity.
D. terminal velocity.
44. A swimmer swims across a pool, and at the end the pool she turns around and pushes
off the wall with her feet. Which option describes a pair of action-reaction forces
during the push?
A. the force of her feet on the wall and the force of the wall on her feet
B. the force of gravity on her body and the force of her feet on the wall
C. the force of gravity on her body and the force of the wall on her feet
D. the force of her feet on the wall and the force of the water on her front
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45. Gravity is a measurable force of attraction which acts upon objects. Which
characteristic determines the gravity of an object?
A. friction
B. mass
C. tension
D. weight
46. Brittany pedaled her bicycle quickly on a level surface. When she stopped pedaling and
coasted, the bicycle slowed and came to a stop. What happened to the energy of the
moving bicycle as it coasted to a stop?
A. It was transferred to heat due to friction.
B. It was reabsorbed into Brittany’s muscles.
C. It was stored in the bicycle wheels as potential energy.
D. It was transferred to the air in the form of visible light.
47. Some race cars are equipped with parachutes to help bring the car to a stop.
Which MOST likely causes the change in the velocity of the race car?
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A. a balanced force exerted by the parachute
B. an increase in the force exerted by the car
C. a net force of zero between the car and parachute
D. an unbalanced force between the car and parachute
48. A toy car starts at the top of a ramp, rolls down and slows to a stop.
Which acts MOST to bring the car to a stop?
A. friction
B. magnetism
C. wind speed
D. electrical force
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49. During a collision, a seat belt slows the speed of a crash dummy. What is the direction
of the net force exerted by the seat belt compared to the direction of the crash dummy’s
motion?
A. in the same direction
B. in a vertical direction
C. in a downward direction
D. in the opposite direction
50 A young boy is shown swinging over the water.
.
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Identify at least two types of friction that will have an effect on his speed. In your
explanation, be sure to include the objects and motions that create friction.
51. Which statement BEST explains why a car that is rolling on a level surface will
eventually come to a stop?
A. Frictional forces oppose the motion of the car.
B. Forward motion slowly runs out as energy is expended.
C. The natural state of an object is to be at rest.
D. Inertia acting on an object will dissipate.
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52. A student conducted an experiment with a toy cart by varying the force applied toward
the right and observing the result. The force applied to the left was constant at 50 N.
The table contains the data collected from the experiment.
MAGNITUDE OF FORCE ACTING
TOWARD THE RIGHT (N)
20N
30N
40N
MOTION OF CART
rapid motion to left
slow motion to left
very slight motion to left
For a force of 50 N to the right, the student would observe
A. a rapid motion to the right.
B. a rapid motion to the left.
C. a slight motion to the right.
D. no motion in either direction.
53. A ball rolls across the floor and slows down to a stop. Which force caused the ball to
slow down?
A. friction
B. gravity
C. magnetic
D. inertia
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54. When a bird flies, its wings push air downward. As a result, the air pushes back
upward on the bird. Which law of motion MOST applies to the way the wings of a bird
beat?
A. All forces act in action-reaction pairs.
B. The rate of acceleration of an object depends on the amount of force applied.
C. Objects in motion tend to remain in motion until acted upon by another force.
D. An unbalanced force acting on an object equals the mass of the object multiplied by its
acceleration.
55. En el Momento 1, una fuerza de F1 se aplica al lado izquierdo de un bloque. El bloque
se mueve a la derecha con una aceleración constante. Luego, en el Momento 2, una
fuerza menor, F2, se aplica al lado derecho del bloque mientras todavía se aplica F1.
¿Qué es MÁS probable que le suceda al bloque en el Momento 2?
A. Se detendrá por completo.
B. Empezará a acelerar hacia la izquierda.
C. Acelerará hacia la derecha a mayor velocidad.
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D. Seguirá acelerando hacia la derecha a menor velocidad.
56. In a tug-of-war game, balanced forces are BEST represented when both teams cause
the flag to
A. stay in the middle.
B. fall to the ground.
C. move slowly in one direction.
D. be pulled quickly in one direction.
57. Un bloque que pesa 10 newton descansa sobre un plano inclinado 30° con respecto a la
horizontal. ¿Cuál es la magnitud de la fuerza normal que actúa sobre el bloque?
A. 5 N
B. 7 N
C. 9 N
D. 10 N
58. As a meteor falls and gets closer to Earth, it encounters a resistance force. Which must
occur so that the meteor overcomes the resistance force?
A. The sum of the forces acting on the meteor needs to be zero.
B. The forces acting on the meteor must be in the same direction.
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C. The force of gravity needs to be greater than the resistance force.
D. The resistance force must be greater than the force being applied to the meteor.
59. When a space shuttle orbited Earth and returned home, a force opposed its motion.
What was the source of the opposing force?
A. friction from the atmosphere
B. the velocity of the shuttle
C. the mass of the shuttle
D. gravity from Earth
60. Un maestro estaba discutiendo con la clase que una bola de boliche tiene más inercia
que una pelota de baloncesto. ¿Cuál propiedad física es MÁS probablemente siendo
comparada?
A. área
B. masa
C. flotabilidad
D. volumen
61. Mimi pushes a book from the edge of a table and releases it at Point 1. It slides across
the table and stops at Point 2.
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Which statement BEST explains the forces that act on the book as it slides across the
table?
A. The friction force increases between Point 1 and Point 2.
B. The friction force decreases momentum between Point 1 and Point 2.
C. The force applied from the push decreases between Point 1 and Point 2.
D. The pushing force starts at Point 1 and the friction force stops at Point 2.
62. Rae dropped a bowling ball from a height of 8 meters. At which distance above the
ground was the ball MOST likely moving at the greatest speed?
A. 7.9 meters
B. 4.0 meters
C. 2.0 meters
D. 0.1 meter
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63. Cody y Adam están halando de una cuerda. Cada estudiante está tratando de halar
hacia su lado la bandera que está amarrada en la mitad de la cuerda.
Si cada niño hala con la fuerza que se muestra, ¿cuál es la fuerza neta que actúa en la
cuerda?
A.
B.
C.
D.
64. Una persona está de pie inmóvil en la superficie de la Tierra en un día lluvioso sin
viento. A esa persona, ¿cuál dirección parecerá caer la lluvia?
A. verticalmente
B. diagonalmente
C. horizontalmente
D. circularmente
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65. Three forces are acting on a ball that is at rest.
If the 5-N force and the 12-N force form a 90-degree angle, what is the magnitude of
the force acting in the direction of the dashed arrow?
A. 7 N
B. 13 N
C. 17 N
D. 60 N
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66. Alicia le da a su hermano un empujón mientras él está sentado en un columpio. Ella
descubre que después de unos pocos segundos, ella necesita empujar otra vez para
mantenerlo moviendo. La razón que su hermano reduce la velocidad es porque la
energía mecánica es convertida en
A. energía potencial que calienta el aire.
B. energía química que mueve el columpio.
C. energía cinética que hace el columpio reducir la velocidad.
D. energía térmica que es liberada en la atmósfera.
67. Students push with opposite forces on the sides of a toy wagon.
What is the net force acting on the wagon?
A.
B.
C.
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D.
68. Mikela changed the tires on her bicycle from street bike tires to mountain bike tires.
With the new tires, she found that her bike moved slower on the road than it had
before, although she worked just as hard to make it go.
1) What force changed when Mikela changed to a different type of tire?
2) Explain how the change in forces acting on the bicycle affected Mikela’s speed.
69. If a leaf and a dime are dropped from the same height, what force will cause the leaf to
fall more slowly?
A. frictional force
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B. centripetal force
C. gravitational force
D. electromagnetic force
70. To move a refrigerator, forces are applied as shown.
Which of these statements BEST describes what will happen if the forces are applied at
exactly the same time?
A. The refrigerator will move left, because of the greatest force on the right.
B. The refrigerator will move right, because the force is over a greater surface area.
C. The refrigerator will remain in place, because the forces are not enough to move a
refrigerator.
D. The refrigerator will remain in the same place, because the net force is zero.
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71. A student pushes a box to slide it across the floor. Which statement explains why the
box begins to move?
A. The weight of the box is greater than the force of friction.
B. The weight of the box is less than the force of friction.
C. The applied force is greater than the force of friction.
D. The applied force is less than the force of friction.
72. A soccer ball is placed at the center of the soccer field.
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If a strong wind is blowing from the west to the east, in which numbered direction
should a player kick the soccer ball in order to have the BEST chances of making it
into one of the goals?
A. 1
B. 2
C. 3
D. 4
73. Students play volleyball on the beach. As the volleyball is about to cross the net, a
strong wind blows. The directions of the ball and the wind are shown in the diagram.
Based on the diagram, in what direction will the volleyball travel after the wind hits it?
A.
B.
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C.
D.
74. A boat is acted on by a river current flowing north and by wind blowing on its sails.
The boat travels northeast. In which direction is the wind MOST likely applying force
to the sails of the boat?
A. west
B. east
C. north
D. south
75. In order for a rope to anchor a boat in place, the rope must exert a force
A. equal to the force exerted by the water current in the opposite direction.
B. equal to the force exerted by the water current in the same direction.
C. greater than the force exerted by the water current in the opposite direction.
D. greater than the force exerted by the water current in the same direction.
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76. Max pushed and released a toy dump truck on a flat sidewalk. The truck traveled for a
long distance and stopped when it hit a wall. Which BEST explains why the truck
traveled the long distance to the wall?
A. The truck had inertia due to its mass.
B. Gravity pulled the truck to the wall.
C. Magnetism pulled the truck to the wall.
D. The sidewalk applied friction to the truck.
77. La tasa de aceleración a un objeto es determinada por la masa del objeto y
A. la velocidad inicial del objeto.
B. las fuerzas que actúan en el objeto.
C. la dirección del movimiento del objeto.
D. el cambio en la energía cinética del objeto.
78. The acceleration due to gravity on Earth is commonly represented by the letter “g.”
Based on this information, which of these quantities represents the weight of a 10-kg
mass on Earth?
A. 10 kg ÷ g
B. 10 kg × g
C. 10 kg + g
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D. 10 kg – g
79. When the two forces are applied to the moving bus, the bus will
A. come to a complete stop because of unbalanced forces.
B. accelerate because of unbalanced forces.
C. slow down because the forces are balanced.
D. move at a constant speed because the forces are balanced.
80. Mrs. Knight drops her briefcase. When the briefcase lands on the floor, what is the
reaction force to the action force of the briefcase on the floor?
A. the force of the floor on the briefcase
B. the attraction of Earth for the briefcase
C. the force of air on the sides of the briefcase
D. the force of friction between the briefcase and the floor
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81. A student swings a ball on a string as shown in the diagram below. The ball follows a
circular path.
Part A: How does centripetal force keep the ball on its circular path?
Part B: Describe one other force acting on the ball.
82. Which statement BEST compares a parked car with a car moving along a straight line
at a constant speed?
A. There are no forces acting on either car.
B. Only the moving car is being subjected to forces.
C. Both cars are being subjected to balanced forces.
D. Only the parked car is being subjected to balanced forces.
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83. The diagram shows forces acting on a box.
Which statement BEST describes what will happen to the box as a result of these forces
being applied?
A. The box will move up.
B. The box will move to the left.
C. The box will move to the right.
D. The box will remain stationary.
84. A 20 N object is placed on a surface and starts to slide. What is the MOST likely reason
the object begins to move?
A. Gravity exerts a balanced force on the object.
B. An unbalanced force causes acceleration.
C. Friction is applied to the object.
D. The forces acting on the object are in equilibrium.
85.
A cart accelerates at a rate of 5.0
when acted on by a net force of 25 N. What is the
magnitude of the acceleration of the cart when acted on by a force of 75 N to the east
and 35 N to the west at the same time?
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A.
7.0
B.
8.0
C.
15
D.
22
86. For a class project, students designed rockets using empty plastic bottles. The bottles
were partially filled with water. Then air was pumped into the bottles using a bicycle
pump. After the contents of the bottles were pressurized, a stopper that held the
pressurized water inside was removed and the bottle launched into the air.
Describe the motion of the bottle after it was launched. Identify the forces acting on the
bottle and describe how the changing forces relate to the motion of the bottle in each
part of its path.
87. The diagram shows two force vectors.
Which statement BEST describes the vectors?
A. The vectors are pulling in opposite directions.
B. The force vectors will represent balanced forces.
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C. The magnitudes of the force vectors are the same.
D. The net force of these vectors will be unbalanced.
88. Un ladrillo está en reposo sobre una superficie plana y lisa. Cuando un estudiante
aplica una fuerza horizontal de 5 N al ladrillo, la fuerza de fricción en el ladrillo es
también 5 N. ¿Cuál afirmación describe MEJOR el efecto de estas dos fuerzas en el
ladrillo?
A. La fuerza neta sobre el ladrillo es 0 N, y el ladrillo empieza a moverse.
B. La fuerza neta sobre el ladrillo es 0 N, y el ladrillo permanece en reposo.
C. La fuerza neta sobre el ladrillo es 10 N, y el ladrillo empieza a moverse.
D. La fuerza neta sobre el ladrillo es 10 N, y el ladrillo permanece en reposo.
89. Cuando montar una montaña rusa, un motor eléctrico jala la montaña rusa hasta la
parte más alta de la primera colina. ¿Qué fuerza jala la montaña rusa hacia abajo la
colima?
A. la fricción
B. la rapidez
C. la gravedad
D. la masa
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90. A brick is resting on a level, smooth surface. When a student applies a horizontal force
of 5 N to the brick, the force of friction on the brick is also 5 N. Which statement BEST
describes the effect of these two forces on the brick?
A. The net force on the brick is 0 N, and the brick begins to move.
B. The net force on the brick is 0 N, and the brick remains at rest.
C. The net force on the brick is 10 N, and the brick begins to move.
D. The net force on the brick is 10 N, and the brick remains at rest.
91. Two forces of 400 newtons (N) each are acting on a box.
Which statement BEST describes the forces at work?
A. The net force applied is zero.
B. A contact force resists movement.
C. The net force applied is unbalanced.
D. A contact force moves the object to the left.
92. One person pulls on a rope with a force of 400 N to the right. Another person pulls on
the opposite end with a force of 600 N to the left. What is the unbalanced net force?
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A. 200 N to the left
B. 400 N to the left
C. 600 N to the left
D. 1000 N to the left
93. The forces that act on an airplane as it flies are shown in the diagram.
If the airplane is moving forward through the air, which statement describes how one
of the forces acting on the airplane has been overcome?
A. The lift force has overcome the drag force.
B. The weight force has overcome the lift force.
C. The thrust force has overcome the drag force.
D. The drag force has overcome the weight force.
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94. Ben coasts along a flat road on his bike. If Ben stops pedaling, his bike will eventually
stop. If energy is conserved, why does the kinetic energy of the bike NOT stay constant
and continue to coast forever?
A. Friction causes some energy to be converted to matter.
B. Friction causes some energy to be converted to heat.
C. The energy is collected by the brake system.
D. The energy is cooled by the rolling tires.
95. A jet plane is moving at a constant velocity on a flat surface. Which forces act against
the forward motion of the plane?
A. gravity and engine thrust
B. engine thrust and friction
C. friction and air resistance
D. air resistance and gravity
96. An object is being subjected to four forces as shown.
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What is the magnitude of the net force acting on the object?
A. x
B. 2x
C. 3x
D. 9x
97. Which mass is undergoing the greatest amount of acceleration?
A. 1 kg subjected to a force of 1 N
B. 1 kg subjected to a force of 100 N
C. 100 kg subjected to a force of 1 N
D. 100 kg subjected to a force of 100 N
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98. In a billiards game, the white cue ball hits the black ball, moving the black ball to the
right while the cue ball moves to the left.
If the action force is applied by the cue ball to the black ball, which force is the reaction
force?
A. the force of gravity on the cue ball
B. the friction applied by the table to the cue ball
C. the force applied to the black ball by the cue ball
D. the force applied by the stick to the cue ball
99. If a ball rolls at a constant rate on a flat surface, the motion is due to
A. gravitational forces.
B. frictional forces.
C. electromagnetic forces.
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D. balanced forces.
100. At Time 1, a force of F1 is applied to the left side of a block. The block moves to the
right with a constant acceleration. Then at Time 2, a smaller force, F2, is applied to
the right side of the block while F1 is still being applied.
What will MOST likely happen to the block at Time 2?
A. It will stop completely.
B. It will begin to accelerate to the left.
C. It will accelerate to the right at a faster rate.
D. It will continue to accelerate to the right at a slower rate.
101. The BEST example of balanced forces is a
A. car increasing speed.
B. bus parked in a garage.
C. ball kicked along a flat surface.
D. roller coaster slowing down on an incline.
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102. Isaac Newton discovered the three laws of motion. Which example BEST illustrates
Newton’s third law of motion, which describes action and reaction forces?
A. a rocket takes off from the ground
B. a book slides forward on a seat when the car stops
C. a heavier ball falls at the same speed as a lighter ball
D. a vehicle rounds a curve and changes its acceleration
103. Students conducted an investigation by dropping a ball from two different heights. In
the first trial, the ball was dropped from a height of 10 meters and the speed was
measured after 2 seconds. In the second trial, the ball was dropped from a height of 20
meters and the speed was measured after 2 seconds. Which of these describes the
relationship between the measured speeds in the two trials?
A. The speed in the second trial will be twice the speed in the first trial.
B. The speed in the first trial will be the same as the speed in the second trial.
C. The speed in the first trial will be 10 m/s faster than the speed in the second trial.
D. The speed in the second trial will be 10 m/s faster than the speed in the first trial.
104. Marcus pushes against a refrigerator with a force of 300 newtons (N) to the right.
Kelli pushes against the refrigerator with a force of 360 N to the left.
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How much additional force could Marcus apply in order to overcome the force
applied by Kelli?
A. 60 N to the right
B. 65 N to the right
C. 365 N to the left
D. 660 N to the left
105. A car runs out of fuel while traveling on a level road and eventually comes to a stop.
Which of the following BEST explains why the car stops?
A. Some of the energy of the car was lost to friction.
B. Some of the energy of the car was destroyed.
C. The amount of kinetic energy increased.
D. The amount of useful energy increased.
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106. The diagram shows three forces being applied to a crate on a floor.
If the crate is to remain stationary, what amount of force must be applied for z?
A. 800 N
B. 1200 N
C. 2000 N
D. 2400 N
107. El diagrama muestra dos ventiladores que soplan aire sobre una pelota.
¿Cuál es la fuerza neta que actúa sobre la pelota?
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A.
B.
C.
D.
108. Dos estudiantes empujan con fuerzas opuestas los lados de un vagón de juguete.
¿Cuál es la fuerza neta que actúa sobre el vagón?
A.
B.
C.
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D.
109. In a game of tug-of-war, the people on each team pull with the amount of force shown.
In which direction will the center of the rope go?
A. to the west because the net force is greater in this direction
B. to the east because the net force is greater in this direction
C. to the west because the net force is less in this direction
D. to the east because the net force is less in this direction
110. A student applies a 10 N force to a wood block with a mass of 5 kg. The block is
pushed across four different surfaces. The accelerations of the block are recorded.
Block Acceleration Data
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Surface
Acceleration
(in meters per
second squared)
1
1.6
2
1.4
3
1.8
4
1.3
Which can be concluded from the information in the table?
A. The block moved for the longest time over Surface 3.
B. The block showed the least friction on Surface 3.
C. The block had the greatest weight on Surface 4.
D. The block had the largest inertia on Surface 4.
111. Two identical sheets of paper are used in an experiment; one is crumpled into a ball
and the other is flat. What will MOST likely happen when they are dropped at the
same time from the same height?
A. flat sheet will fall on its edge
B. both will fall at the same rate
C. crumpled sheet will fall faster
D. crumpled sheet will move horizontally
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112. A student pushes on an object with a force of 6 newtons and the object does not move.
What force does the object exert on the student’s hands?
A. 0 N
B. 3 N
C. 6 N
D. 12 N
113. Over which substance will the wooden box move MOST easily?
A.
B.
C.
D.
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114. A car is traveling on a highway at a constant velocity. Which statement BEST
describes the forces acting on the car?
A. The forces acting on the car are balanced.
B. The forces acting on the car are in the same direction.
C. The forces acting on the car are continuing to increase.
D. The forces acting on the car are equal to the force of gravity.
115. When two unequal forces act in opposite directions on a moving object, the object will
A. absorb the forces.
B. come to an immediate stop.
C. continue to move in the same direction.
D. move in the same direction as the larger force.
116. Brandon pushes an object on a ramp as shown in the diagram.
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While Brandon pushes the object and it remains in contact with the ramp, which
force has the greatest effect on causing it to slow?
A. the applied force
B. a frictional force
C. the force due to gravity
D. a force of air resistance
117. Newton’s first law of motion states that an object at rest will stay at rest unless acted
upon by an outside force. Which activity is an example of this law?
A. A football is kicked off a tee.
B. A baseball player slides into second base.
C. A floating stick is carried over a waterfall.
D. A bicycle travels faster as it goes downhill.
118. When riding a roller coaster, an electric motor pulls the roller coaster to the top of the
first hill. What force pulls the roller coaster down the hill?
A. friction
B. speed
C. gravity
D. mass
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119. When the roller coaster rolls onto a flat section of track, what force would ultimately
bring it to a stop if no other forces are added?
A. gravity
B. weight
C. friction
D. acceleration
120. A ball on a cart is moving at a rate of 2 m/s. The cart suddenly stops and the ball
continues to travel in the same direction at the same speed. This is an example of the
A. law of gravity.
B. first law of motion.
C. second law of motion.
D. third law of motion.
121. Which is an example of balanced forces?
A. a door starting to open
B. a basketball being held
C. a truck beginning to accelerate
D. a book falling off a table
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122. What is one way land helps reduce the force of a hurricane as it moves inland?
A. Land filters the water forced up from the sea by the wind.
B. Land acts as a bumpy surface that absorbs wind power.
C. Land stabilizes the sediment forced on shore.
D. Land absorbs the rainwater.
123. The picture shows a cross-country skier.
What causes the skier to move forward?
A. The skier’s arms move backward.
B. The skier pushes the poles against the snow.
C. The skier’s legs move forward over the snow.
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D. The skier leans his body forward.
124. Roland dropped a rubber ball straight down. After falling for 2 seconds, the ball
struck the ground with a force of 50 newtons (N). Which vector illustrates the reaction
force of the ground exerted on the ball?
A.
B.
C.
D.
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125. The box is being pushed to the right with a force of 300 newtons, and to the left with a
force of 400 newtons.
Which is the net force on the box?
A. 300 newtons
B. 400 newtons
C. 700 newtons
D. 100 newtons
126. Which of the following combinations of forces results in the object accelerating to the
right?
A.
B.
C.
D.
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127. A battery-powered toy sailboat heading south on a pond catches a wind blowing from
east to west. The combination of forces will cause the sailboat to move in which
direction?
A. northeast
B. northwest
C. southeast
D. southwest
128. Four forces act on a box as shown.
What is the magnitude of the net force on the box?
A. 3 N
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B. 5 N
C. 22 N
D. 37 N
129. A student draws a car with two vectors.
Which statement would BEST describe the diagram?
A. The forces of 800 N and 400 N should be multiplied to get the net force being applied
to the car.
B. The applied forces of 800 N and 400 N will result in the car moving to the right.
C. The forces acting on the car are equal in magnitude and the car will remain motionless.
D. The magnitude of the forces acting on the car are the same but the directions are
opposite.
130. A 6-N force and an 8-N force act at a 90-degree angle to each other on the same
object. What is the magnitude of the net force acting on the object?
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A. 2 N
B. 5 N
C. 10 N
D. 14 N
131. Si la pelota de la siguiente ilustración se desplaza hacia el este, ¿cuál fuerza no
equilibrada debe de estar actuando sobre ella?
A.
B.
C.
D.
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132. A block weighing 10 newtons is resting on a plane inclined 30° to the horizontal. What
is the magnitude of the normal force acting on the block?
A. 5 N
B. 7 N
C. 9 N
D. 10 N
133. Which example BEST illustrates an action-at-a-distance force?
A. lifting a box
B. an apple falling
C. pulling a nail out of wood
D. a car moving along a flat surface
134. Review the diagram.
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If the ball is at rest on the soccer field and the four forces shown are applied at the
same time, the ball will
A. move to the left.
B. stay in the same position.
C. resist any change in movement.
D. accelerate in the direction of the smallest force.
135. Students are designing kites to discover what type of kite flies the highest. Which is
the MOST important to consider when designing a kite to fly high?
A. string length
B. surface area
C. materials used
D. time of day
136. Alicia gives her brother a push while he is seated on a swing. She finds that after a few
seconds, she needs to push again to keep him going. The reason her brother slows
down is because the mechanical energy is converted into
A. potential energy that heats the air.
B. chemical energy that moves the swing.
C. kinetic energy which makes the swing slow down.
D. thermal energy that is released into the atmosphere.
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137. Which of these is an example of Newton’s first law of motion?
A. A baseball hit with a baseball bat travels faster than a bowling ball hit with the same
force.
B. A basketball bounces on the ground with the same force that the ground pushes up on
the ball.
C. A person jumps to a dock from a boat, and the boat moves away from the dock.
D. A person standing on a bus moves backward when the bus suddenly moves forward.
138. The diagram shows forces acting on a ball at the same time.
Which arrow BEST shows the direction that the ball will move?
A.
B.
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C.
D.
139. What advantage does a hiker have if he used snowshoes to walk across deep snow as
opposed to regular hiking boots?
A. He would be able to slide on ice.
B. He would be able to keep his feet warmer.
C. His weight would be distributed over a larger area.
D. The snow would melt quicker, and it would be harder to walk.
140. A student concludes that no forces are being applied to a laboratory cart that is
moving at a constant velocity. Which statement BEST explains why the student’s
conclusion is incorrect?
A. The cart must be subjected to a net force to continue moving at the same speed.
B. The direction of the cart is changed after unbalanced forces are applied.
C. The cart is subjected to an applied force that cancels the effect of friction.
D. The net force on the cart must be in the direction of motion to overcome friction.
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141. La señora Knight deja caer su maletín. Cuando el maletín cae en el piso, ¿cuál es la
fuerza de reacción a la fuerza de acción del maletín en el piso?
A. la fuerza del piso en el maletín
B. la atracción de la Tierra para el maletín
C. la fuerza del aire en los lados del maletín
D. la fuerza de la fricción entre el maletín y el piso
142. The drawing shows a cup on a table.
Which statement BEST describes the relationship between the cup and the table?
A. The cup is accelerating faster than the table.
B. The cup is pushing on the table.
C. The cup is doing work on the table.
D. The forces on the cup are unbalanced.
143. Mountain bike tires have large, knob-like treads. These tires are useful on steep slopes
because they
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A. increase friction.
B. carry heavy weights.
C. increase the stopping distance.
D. prevent braking of the bicycle.
144 Two students are pushing a sofa across a room.
.
What is the net force applied to the sofa by the students?
A. 150 N
B. 200 N
C. 250 N
D. 400 N
145. A baseball player swings his bat and hits a ball along the ground. After some time, the
ball rolls to a stop on the level playing field.
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What MOST likely causes the ball to stop moving?
A. a frictional force
B. the size of the bat
C. the mass of the ball
D. a gravitational force
146. El diagrama muestra dos fuerzas actuando sobre una pelota al mismo tiempo.
¿Cuál flecha representa la dirección MÁS probable en la que se moverá la pelota?
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A.
B.
C.
D.
147. During class the teacher showed an enlarged image of a small piece of sidewalk. The
students saw that the sidewalk was rougher than they had previously thought.
Which effect would the rough surface have on a box that is pulled along the sidewalk?
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A. It would reduce the amount of work that is performed when pulling the box.
B. It would oppose the force that is being applied to the box when it is pulled.
C. It would decrease the resistance between the forces that are pulling the box.
D. It would help reduce the force of gravity when the box is pulled.
148. A student reads his paper on friction to the class. Which statement should he include
in his paper if he wants to present accurate information?
A. Friction increases mechanical advantage.
B. Friction opposes the direction of movement.
C. Friction makes movement of an object easier.
D. Friction reduces the amount of work used to move an object.
149. Un avión está volando con una fuerza neta de cero. Esto significa que el avión está
A. desacelerando y perdiendo altitud.
B. moviéndose a una velocidad constante y perdiendo altitud.
C. desacelerando y viajando a lo largo de una línea recta.
D. moviéndose a una velocidad constante y viajando a lo largo de una línea recta.
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150. A teacher was discussing with the class that a bowling ball has more inertia than a
basketball. Which physical property is MOST likely being compared?
A. area
B. mass
C. buoyancy
D. volume
151. When a speeding meteor enters Earth’s atmosphere, it slows down and becomes very
hot due to friction. Which factor MOST influences the amount of friction that a
meteor encounters when it enters the atmosphere?
A. the weather
B. magnetism
C. solar energy
D. air density
152. Raúl dejó caer una bola de boliche de una altura de 8 metros. ¿A qué distancia arriba
el suelo MÁS probablemente estaba moviendo la bola a la mayor velocidad?
A. 7.9 metros
B. 4.0 metros
C. 2.0 metros
D. 0.1 metro
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153. In the diagrams the arrows represent forces exerted on the boxes. Which diagram
represents a box that will remain stationary?
A.
B.
C.
D.
154. What is the amount of force required to accelerate a 20 kg object to 5 m/s²?
A. 0.25 N
B. 4 N
C. 15 N
D. 100 N
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155. A 60-kg man and a 25-kg boy, both on roller skates, push off of each other using their
hands. Which of these describes the motion of the two people?
A. The man moves farther and faster than the boy.
B. The boy moves farther and faster than the man.
C. The man moves farther but the same speed as the boy.
D. The boy moves faster but the same distance as the man.
156. Una pelota en un carrito se mueve a una velocidad de 2 m/s. El carrito de repente se
detiene y la pelota continúa a viajar en la misma dirección a la misma rapidez. Esto es
un ejemplo de la
A. ley de la gravedad.
B. primera ley del movimiento.
C. segunda ley del movimiento.
D. tercera ley del movimiento.
157. An object is traveling to the right. Which of the following shows a force acting on the
object that will increase the speed of the object?
A.
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B.
C.
D.
158. ¿Sobre cuál sustancia se moverá MÁS fácilmente la caja de madera?
A.
B.
C.
D.
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159. La aceleración a causa de la gravedad en la Tierra es representada comúnmente por
la letra “g”. Según esta información, ¿cuál de estas cantidades representa el peso de
una masa de 10 kg en la Tierra?
A. 10 kg ÷ g
B. 10 kg × g
C. 10 kg + g
D. 10 kg – g
160. A rock with a mass of 10.0 kg is balanced on top of a large boulder. Describe the
forces acting on the rock, and use the concept of forces to explain why it stays on top
of the boulder.
161.
Una carreta acelera a una tasa de 5.0
cuando es actuada por una fuerza neta de 25
N. ¿Cuál es la magnitud de la aceleración de la carreta cuando es actuada por una
fuerza de 75 N al este y 35 N al oeste al mismo tiempo?
A.
7.0
B.
8.0
C.
15
D.
22
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162. Two forces act in opposite directions on a wood block. What will happen if the forces
are unbalanced?
A. The block will balance the forces.
B. The forces will reverse direction.
C. The mass of the block will change.
D. The position of the block will change.
163. The rate of acceleration of an object is determined by the mass of the object and
A. the initial velocity of the object.
B. the forces acting on the object.
C. the direction of movement of the object.
D. the change in kinetic energy of the object.
164. During a demonstration on falling objects, a science teacher explained to the class that
all objects acted upon by gravity alone will fall at the same rate. The teacher then took
two identical sheets of paper and crumpled one of them into a ball and left the other
sheet in its flat form. The teacher dropped the crumpled and flat sheets of paper from
the same height and at the same time. Which statement BEST explains why the
crumpled sheet landed on the floor before the flat sheet landed on the floor?
A. The crumpled sheet weighed more than the flat sheet.
B. The crumpled sheet weighed less than the flat sheet.
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C. More air resistance acted on the crumpled sheet than on the flat sheet.
D. Less air resistance acted on the crumpled sheet than on the flat sheet.
165. Two people are pushing a car. One person is pushing with a force of 450 N and the
other person is pushing with a force of 300 N. What information is needed to
determine the net force applied to the car by the people?
A. the direction of the road
B. the direction of the forces
C. the weight of the two people
D. the weight of the automobile
166.
The block shown is accelerating in the direction of the 10-N force at a rate of
What is the magnitude of force X?
A. 1 N
B. 5 N
C. 10 N
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D. 20 N
167. ¿Cuál afirmación describe MEJOR el movimiento de un objeto que está siendo
sometido a dos fuerzas de igual magnitud en las direcciones opuestas?
A. El objeto está acelerando en la dirección del movimiento.
B. El objeto está en reposo o se mueve a una velocidad constante.
C. El objeto está acelerando a una tasa que depende de la magnitud de las fuerzas.
D. El objeto comienza desde reposo y luego empieza a moverse a una velocidad constante.
168. All of the forces acting on a helicopter are balanced.
The reduction of which force would cause the helicopter to drop in altitude?
A. lift
B. drag
C. thrust
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D. weight
169. In which of the following cases would a decrease in friction be MOST beneficial?
A. the friction between the shoes of a jogger and the jogging track
B. the friction between the wheels of a car and the surface of a road
C. the friction between a rotating pulley and the axle that supports the pulley
D. the friction between a rotating pulley and the rope that is used with the pulley
170. Cuando un pájaro vuela, sus alas empujan el aire hacia abajo. Como resultado, el aire
empuja hacia arriba en el pájaro. ¿Cuál ley de movimiento aplica MÁS a la manera
en que baten las alas de un pájaro?
A. Todas las fuerzas actúan en pares de acción-reacción.
B. La tasa de aceleración de un objeto depende de la cantidad de la fuerza aplicada.
C. Los objetos en movimiento tienden a permanecer en movimiento hasta que son
actuados por otra fuerza.
D. Una fuerza desequilibrada que actúa sobre un objeto es igual a la masa del objeto
multiplicada por su aceleración.
171. A student walking quickly while carrying an orange on his lunch tray stops suddenly.
The orange will MOST likely roll off the tray due to
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A. inertia of the orange.
B. centripetal force of the orange.
C. the friction acting on the orange.
D. the balanced forces acting on the orange.
172. When a skydiver jumps from a plane, the open parachute will increase the air
resistance by
A. reducing fluid friction.
B. increasing surface area.
C. increasing terminal velocity.
D. decreasing mass.
173. When the first American astronauts were planning to walk on the Moon, they knew
that the gravity on the Moon was less than the gravity on Earth. With this
information, what did the astronauts expect to be MOST different on the Moon?
A. their mass
B. their height
C. their weight
D. their volume
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174. An airplane is flying with a net force of zero. This means the airplane is
A. slowing down and losing altitude.
B. moving at a constant speed and losing altitude.
C. slowing down and traveling along a straight line.
D. moving at a constant speed and traveling along a straight line.
175. Una fuerza de 6 N y una fuerza de 8 N actúan a un ángulo de 90 grados entre sí en el
mismo objeto. ¿Cuál es la magnitud de la fuerza neta que actúa sobre el objeto?
A. 2 N
B. 5 N
C. 10 N
D. 14 N
176. Nicolas is playing with his toy car. A parachute in the back of the car is released to
help slow down the car.
If the forces act on the car as shown in the picture, what is the net force?
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A.
B.
C.
D.
177. When astronauts walked on the Moon, they used weighted boots to help them walk
due to the lower gravitational pull. What difference between Earth and the Moon
accounts for the difference in gravity?
A. density
B. diameter
C. mass
D. volume
178. Two students pull on a rope with 100 N in opposite directions. If the student on the
left increased her force to 125 N, the rope would MOST likely
A. go from rightward acceleration to leftward acceleration.
B. go from motionless to leftward acceleration.
C. decrease its leftward acceleration.
D. decrease its rightward acceleration.
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179. The diagram shows two fans blowing air on a ball.
What is the net force acting on the ball?
A.
B.
C.
D.
180. Cuando los astronautas caminaron en la Luna, usaron botas con peso para ayudarlos
caminar debido a la atracción gravitacional más baja. ¿Qué diferencia entre la Tierra
y la Luna cuenta por la diferencia en la gravedad?
A. la densidad
B. el diámetro
C. la masa
D. el volumen
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181. Angela blows air into a balloon and holds the end of it closed with her fingers. When
she lets go of the end of the balloon, Angela observes that the release of the air propels
the balloon.
The propelling of the balloon from the release of the air is an example of which of
Newton’s laws?
A. For every action, there is an equal and opposite reaction.
B. A force of attraction exists between any two objects with mass.
C. The force of an object is the product of its mass multiplied by its acceleration.
D. An object in motion tends to stay in motion unless an unbalanced force acts upon it.
182. A boat moves forward through water with a force of 5,100 newtons (N). The water
resists with forces equaling 4,800 N. What is the net force acting on the boat?
A. 300 N
B. 4,800 N
C. 5,100 N
D. 9,900 N
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183. When a 10-kg object falls through the atmosphere at terminal velocity, what is the net
force acting on the object?
A. zero
B. 98 N
C. > 98 N
D. > 0 N < 98 N
184. The illustration shows the relative motion of an airplane wing and the air around it.
What is the BEST explanation for why the wing is curved on top?
A. to decrease downward pressure of air above the wing
B. to increase downward pressure of air above the wing
C. to decrease downward pressure of air below the wing
D. to increase downward pressure of air below the wing
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185. A bowling ball sitting motionless on a table exerts a downward force on the table. The
force exerted by the table must be
A. equal to the force of the ball.
B. continually changing with the ball.
C. greater than the force of the ball.
D. less than the force of the ball.
186. If the ball in the picture below moves east, which unbalanced force must be acting on
it?
A.
B.
C.
D.
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187. A student measures the acceleration of a stone block on a level surface when the block
is acted upon by a known force. What additional information is needed to precisely
calculate the block’s mass?
A. the block’s density
B. the amount of friction
C. the mass of the surface
D. the direction of motion
188. Cody and Adam are pulling on a rope. Each boy is trying to pull the flag attached to
the middle of the rope to his side.
If each boy pulls with the force shown, what is the net force acting on the rope?
A.
B.
C.
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D.
189. Mac and Janelle found a plate of cookies waiting on the center of the square kitchen
table when they got home. Each of them reached for the plate from opposite side of
the table. Both of them grabbed the plate at the same time.
If Mac pulled with a force of 18 newtons (N) and Janelle pulled with a force of 20
newtons (N), which correctly describes the forces applied to the plate of cookies?
A. The forces are equal and opposite in direction.
B. The forces applied to the plate of cookies are balanced.
C. The net force applied to the plate of cookies is 2 newtons (N).
D. The net force applied to the plate of cookies is 38 newtons (N).
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