9.8 Mock Exam 2
7N___ FN____________ EN___________________
1. A student holds a 10 kg box 1 meter above the ground for 5 s. How much power does the student
generate?
a. 0 W
b. 98 J
c. 0 J
d. 98 W
2. The number 0.0045 terameters can be expressed in megameters as:
a. 0.45 megameters
b. 4.5 megameters
c. 45 megameters
d. 450 megameters
e. 4500 megameters
3. The strength of an electric force depends upon which two things?
a. The magnitude of each charge and the size of the electric field
b. The distance between the charges and their masses
c. The number of protons and the distance between the charges
d. The magnitude of each charge and the distance between the charges
4. Which of the following measurements is a scalar?
a. acceleration
b. force
c. momentum
d. velocity
e. work
5. ________measures how hard it is to accelerate an object.
a. Mass
b. Weight
c. Inertia
d. Momentum
6. ________measures how hard it is to stop an object.
a. Mass
b. Weight
c. Inertia
d. Momentum
7. A 12 kg rock falls from rest off a cliff and hits the ground in 1.5 s. What is the rock's momentum
just before it hits the ground?
a. 8 kg·m/s
b. 18 kg·m/s
c. 96 kg·m/s
d. 176 kg·m/s
8. A 16.0-Newton force is applied parallel to an inclined plane in order to move a 2.8-kg cart from
ground level a distance of 1.4 meters along the inclined plane to the top at a constant speed. The
potential energy of the cart at the top of the incline is approximately ____ Joules.
a. 2.8
b 3.9
c. 8.0
d. 22.4
9. A 5 kg rock falls from a height of 10 meter. How much kinetic energy will the rock have the
moment it is about to strike the ground?
a. 0 J
b. 25 J
c. 50 J
d. 490 J
10. A balloon is rubbed on hair so that the two objects become oppositely charged. This is called
a. Charging by induction
b. Charging by friction
c. Charging by conduction
d. Charging by contact
11. A book with a mass of 6.82 kg sits at rest on a table. The magnitude of the normal force pushing
up on the book is:
a. 0 N
b. Less than 6.82 N
c. Exactly 6.82 N
d. More than 6.82 N
12. A car crashes into a truck, exerting a force of 1000 N on it. If the truck has twice as much mass as
the car, what magnitude of force is exerted on the car by the truck?
a. 0 N
b. 500 N
c. 1000 N
d. 2000 N
13. A completely inelastic collision is one in which the two colliding particles
a. Are separated after collision
b. Remain together after the collision
c. Split into small fragments flying in all directions
d. None of the above
14. A cyclist travelling south at 15 m/s applies the brakes and slows to a stop in 10 s. What is her
acceleration?
a. 150 m/s² south
b. 150 m/s² north
c. 1.5 m/s² north
d. 1.5 m/s² south
15. A heavy object and a light object have the same momentum. Which has the greater speed?
a. heavy object
b. light object
c. both have the same speed
d. the heavy object has a zero speed while the light object has a nonzero speed
16. A man is walking through an airport with a suitcase. The man exerts a constant upward force
upon the suitcase as he walks horizontally a distance of 20 meters. In this example, the man is
doing ____ work upon the suitcase.
a. zero
b. negative
c. positive
d. nonsense! It is impossible to tell without knowledge of the force value.
17. A neutral metal sphere is touched by a positively-charged metal rod. During the process,
electrons are transferred from the _____ to the _____ and the sphere acquires a _____ charge.
a. neutral sphere, charged rod, negative
b. neutral sphere, charged rod, positive
c. charged rod, neutral sphere, negative
d. charged rod, neutral sphere, positive
18. A period of 0.005 seconds would be equivalent to a frequency of ____ Hz.
a. 20
b. 50
c. 200
d. 500
19. A physicist measures the amount of energy used by a lightbulb. What units should she use to
record her measurement?
a. Joules (J)
b. Joules-per-second (J/s)
c. Watts (W)
d. Kilograms-meters-per-second-squared (kg·m/s² ).
20. A plant pot which weighs 20 N falls from a window 10 m high. How fast is it going when it reaches
the ground?
a. 14 m/s
b. 10 m/s²
c. 200 m/s
d. 30 m/s
21. A roller coaster car is coasting down the first drop of the track. Assume that resistance forces
have no effect on the car's motion. In this situation, the total mechanical energy of the car ____.
a. will definitely change
b. will remain constant
c. will probably change, but might not if the car's acceleration is decreasing
d. nonsense! None of these predictions are possible without actual energy values.
22. A skydiver is falling through the air at a constant speed. Which one of the following statements is
true of the skydiver?
a. Its kinetic energy is zero.
b. Its kinetic energy is increasing.
c. Its kinetic energy is decreasing.
d. Its kinetic energy is constant.
23. A wave that is 4 m long has a velocity of 2 m/s. What is its period?
a. 4 s
b. 0.5 s
c. 2 s
d. 8 s
24. According to the law of conservation of momentum, the total momentum of two bodies
_________ after a collision.
a. increases
b. decreases
c. becomes zero
d. remains constant
25. An alien spacecraft travelling at 500 m/s runs out of fuel. What would happen to its motion?
a. It would immediately stop.
b. It would gradually slow down and eventually stop.
c. Its motion would be unchanged.
d. It would have negative acceleration.
26. An athlete races up a hill 10 m high at a constant velocity. If her mass is 50 Kg and she reaches
the top, how much work did she do if g = 10 m/s/s?
a. 500 J
b. 150 J
c. 5 kJ
d. 50 kJ
27. An athlete races up a hill 20 m high. If her weight is 500 N and she reaches the top in 5 s, how
powerful is she?
a. 200 W
b. 2000 W
c. 100 W
d. 1000 W
28. An example of an elastic collision is when,
a. Your physics teacher gets mad and throws a piece of clay at the wall, where the clay sticks
b. Two planes crashing into each other in the air
c. When two pool balls collide and fly off in different directions
d. When two football players hit each other and hold onto each other
29. An object experiences a rightward force of 5 N, a leftward force of 3 N, an upward force of 10 N
and a downward force of 10 N. Which one of the following conclusions can be made about the
object’s motion?
a. It will accelerate.
b. If it is at rest, then it will stay at rest.
c. If it is moving, then it will slow down.
d. If it is moving, then it will speed up.
30. An object is moving east and slowing down. Its velocity is directed ______ and its acceleration is
directed _____.
a. east, west
b. west , east
c. east, east
d. west , west
31. An object weighs 60 N on earth. Describe what will happen when the object is taken to the sun
where the acceleration due to gravity is g = 274 m/s²
a. The mass will increase and the weight will stay the same
b. The mass will decrease and the weight will stay the same
c. The mass will stay the same and the weight will increase
d. The mass will stay the same and the weight will decrease
32. Displacement vectors of 4 km south, 2 km north, 5 km south, and 5 km north combine to a total
displacement of _____.
a. 16 km north
b. 11 km west
c. 6 km south
d. 2 km south
33. Each croquet ball in a set has a mass of 0.50 kg. The green ball travels at 10.5 m/s and strikes a
stationary red ball. If the green ball stops moving, what is the final speed of the red ball after the
collision?
a. 0 m/s
b. 10.5 m/s
c. 21.0 m/s
d. 42 m/s
34. If two masses are moved 3 times further apart then the factor of change in the gravitational force
is __________.
a. 1/3
b. 2
c. 1/9
d. 9
35. Newton's 3rd law action/reaction forces do not cancel on an object because
a. they have different magnitudes
b. they are acting on different objects
c. they are in the same direction
d. They do cancel! They are equal and opposite!
36. Substances through which charges have difficulty moving are called ____.
a. electators
b. conductors
c. engineers
d. insulators
37. The electric field lines of a proton __________.
a. Point outwards
b. Point inwards
c. Are circular
d. Are not vectors
38. Two bodies of masses 2 kg and 7 kg are moving with velocities of 2 m/s and 7 m/s respectively.
What is the total momentum of the system in kg-m/s?
a. 50
b. 53
c. 28
d. 0
39. What can be measured in Kg·m²/s²?
a. Work
b. Force
c. Momentum
d. Acceleration
40. What is the frequency of a wave that has a period of 0.25 s?
a. 2.5 Hz
b. 0.5 Hz
c. 0.25 Hz
d. 4 Hz
41. What is the total mechanical energy of a 2 kg object flying 5 m above the ground at the speed of
3 m/s?
a. 9 J
b. 30 J
c. 98 J
d. 107 J
42. When two waves interact and the amplitude increases this is known as ______?
a. A standing wave
b. Destructive interference
c. Positive interference
d. Constructive interference
43. Which is a unit for weight?
a. kg
b. kg·m/s
c. kg·m/s²
d. kg·m2/s2
e. kg·m2/s3
44. Which of the following are examples of acceleration?
I. A car making a left turn at a constant speed
II. A car stopped at a red light in traffic
III. A car slowing down for a moving train
a. I only
b. II only
c. I and II only
d. I and III only
45. Which of the following is a vector?
a. Speed
b. frequency
c. Temperature
d. charge
e. change in momentum
46. Which of the following shows an object with constant velocity?
a. A car speeding up on a straight section of the highway.
b. A train moving at a constant speed around a curve.
c. A roller coaster as it slows down on a hill.
d. A rock falling straight down at a constant speed.
47. You have an object with a mass of 30 kg. You take it to Jupiter where the gravitational
acceleration is 25 m/s/s. What will be the object's weight on Jupiter?
a. 55 kg
b. 55 N
c. 750 kg
d. 750 N