Chapter 6 exam
Multiple Choice
Identify the choice that best completes the statement or answers the question.
____
1. If a baseball and a cannonball are dropped from the same height at the same time, which ball will hit the
ground first?
a. the cannonball
c. The balls land at the same time.
b. the baseball
d. the ball with the larger volume
____
2. In what direction is a projectile accelerated?
a. both vertically and horizontally
b. vertically downward
c. vertically upward
d. horizontally forward
____
3. Which is a common unbalanced force acting on objects in motion?
a. inertia
c. friction
b. acceleration
d. speed
____
4. A car with a mass of 1400 kg moves along the ice with a constant velocity of 18.0 m/s. What is the car’s
momentum?
a. 77.8 N
c. 77.8 kg • m/s
b. 25,200 N
d. 25,200 kg • m/s
____
5. When a bowling ball collides with a bowling pin, the momentum of the ball
a. increases slightly as the velocity of the pin increases.
b. decreases slightly as the velocity of the pin increases.
c. decreases slightly as the velocity of the pin decreases.
d. does not change at all.
____
6. If a moving boxcar gently collides with a boxcar at rest and the two boxcars move together, their combined
momentum will be
a. greater than the original momentum of the moving boxcar.
b. equal to the original momentum of the moving boxcar.
c. less than the original momentum of the moving boxcar.
d. zero.
____
7. The law of conservation of momentum states that when two objects collide, their combined momentum
a. increases after the collision.
b. remains the same after the collision.
c. decreases after the collision.
d. cannot be determined after the collision.
____
8. Which of the following is NOT an example of projectile motion?
a. the path of a leaping frog
b. the path of an arrow through the air
c. the path of a crate sliding along flat ground
d. the path of a pitched baseball
____
9. A 5 kg object has less inertia than an object with the following mass of (1 kg = 1,000 g)
a. 4 kg.
c. 2 kg.
b. 6,000 g.
d. 1,500 g.
____ 10. According to Newton’s first law of motion, a moving object that is not acted on by an unbalanced force will
a. remain in motion.
c. change its momentum.
b. eventually come to a stop.
d. accelerate.
____ 11. A cue ball rolls toward a billiard ball with a velocity of 1.0 m/s east. Both balls have identical masses. What
happens to the total momentum after the two balls collide?
a. It is greater than the original momentum of the cue ball.
b. It is equal to the momentum before the collision.
c. It is less than the original momentum of the cueball.
d. It is equal to zero.
____ 12. An ice skater with a mass of 65 kg moves along the ice with a constant velocity of 2.0 m/s. What is the
skater’s momentum?
a. 130 kg • m/s
c. 130 N
b. 32 kg • m/s
d. 32 N
____ 13. If three balls of steel, rubber, and plastic were dropped at the same time from the same height, which would
hit the ground first? (Assume there is no air resistance.)
a. All would hit at the same time.
c. The steel ball would hit first.
b. The rubber ball would hit first.
d. The tennis ball would hit first.
____ 14. The mass of which of the following objects (1 kg = 1,000 g) has more inertia than a 5 kg object?
a. 4 kg
c. 2 kg
b. 6,000 g
d. 1,500 g
____ 15. An astronaut uses a jet of nitrogen to maneuver in space. This can be done because of
a. orbiting.
c. momentum conservation.
b. free fall.
d. inertia.
____ 16. Why does a crumpled piece of paper land before a flat sheet of paper?
a. Gravity exerts more force on the crumpled paper.
b. There is more air resistance on the flat paper.
c. The crumpled paper is heavier.
d. The crumpled paper is lighter.
____ 17. Why do astronauts in an orbiting spacecraft seem weightless?
a. Nothing produces gravity in space.
b. The astronauts and the ship are in free fall together.
c. The astronauts have no mass in space.
d. Air resistance balances the force of gravity.
____ 18. Why does a ball thrown level to the ground move downward?
a. There is no force on the ball.
b. A force pulls on the ball in the direction it is thrown.
c. Gravity pulls on the ball toward the ground.
d. Forces pull on the ball in both directions.
____ 19. An ice skater at rest pushes against a sled at rest, causing both the skater and sled to move away from each
other with different accelerations. This is an example best described by
a. Newton’s first law of motion for objects at rest.
b. Newton’s first law of motion for objects in motion.
c. Newton’s second law of motion.
d. Newton’s third law of motion.
____ 20. A sled sliding on a flat, icy surface with a constant velocity is best described by
a. Newton’s first law of motion for objects at rest.
b. Newton’s first law of motion for objects in motion.
c. Newton’s second law of motion.
d. Newton’s third law of motion.
Completion
Complete each statement.
Use the terms from the following list to complete the sentences below.
momentum
inertia
free fall
projectile motion
terminal velocity
21. Only in a vacuum or in space can an object be in _____________________.
Use the terms from the following list to complete the sentences below.
free fall
inertia
momentum
centripetal force
22. The product of the mass and velocity of an object is called the ____________________.
23. The tendency of all objects to resist any change in motion is called ____________________.
24. The forward motion of a spacecraft combines with its motion in ____________________ to cause orbiting.
Use the terms from the following list to complete the sentences below.
velocity
gravity
centripetal force
projectile motion
25. A satellite stays in orbit around Earth because of ____________________.
26. The ____________________ of a falling object can be calculated if the acceleration due to gravity and the
time the object falls are known.
27. The paths of a pitched baseball and an arrow released from a bow are both examples of
____________________.
28. A pitched baseball follows a curved path because of acceleration by the force of ____________________.
Use the terms from the following list to complete the sentences below.
third
decreases
half
29. According to the law of conservation of momentum, when two objects stick together after a collision, their
velocity ____________________.
30. The law of conservation of momentum is equivalent to Newton’s ____________________ law of motion.
Matching
Match each item with the correct statement.
a. terminal velocity
b. free fall
c. projectile motion
d. centripetal force
e. air resistance
f. orbit
____ 31. the path of one object around another in space
____ 32. an unbalanced force that causes objects to move in a circular path
____ 33. the motion of a body when only gravity acts on it
____ 34. the curved path of a thrown object near Earth’s surface
____ 35. the constant velocity of a falling object when the force of gravity is balanced by air resistance
____ 36. the force that opposes the motion of objects through air
Match each item with the correct statement.
a. the law of conservation of momentum
b. Newton’s first law of motion
c. Newton’s second law of motion
d. Newton’s third law of motion
e. terminal velocity
f. inertia
____ 37. the velocity of a falling object when the force of gravity is balanced by the force of air resistance
____ 38. the relationship between an object’s acceleration and its mass and force acting on it
____ 39. An object at rest remains at rest, and an object in motion remains in motion at constant speed and in a straight
line unless acted on by an unbalanced force.
____ 40. All forces act in pairs.
Short Answer
41. You are a passenger in a car that is moving rapidly down a straight road. As the driver makes a sharp left turn,
you are pressed against the right side of the car. Explain why this happens.
42. A skier with a mass of 45 kg moves with a velocity of 10.0 m/s east. What is the skier’s momentum?
43. When does an object reach its terminal velocity?
Problem
44. A 0.151 kg baseball is pitched with a velocity of 43.1 m/s. Ignoring air resistance, what is the baseball’s
momentum after being pitched? Show your work.
Other
INTERPRETING GRAPHICS
Use the figure below to answer the following questions.
45. _____ the path of the orbiting spacecraft
46. _____ curve of Earth’s surface
Chapter 6 exam
Answer Section
MULTIPLE CHOICE
1. ANS:
OBJ:
2. ANS:
OBJ:
3. ANS:
OBJ:
4. ANS:
OBJ:
5. ANS:
OBJ:
6. ANS:
OBJ:
7. ANS:
OBJ:
8. ANS:
OBJ:
9. ANS:
OBJ:
10. ANS:
OBJ:
11. ANS:
OBJ:
12. ANS:
OBJ:
13. ANS:
OBJ:
14. ANS:
OBJ:
15. ANS:
OBJ:
16. ANS:
OBJ:
17. ANS:
OBJ:
18. ANS:
OBJ:
19. ANS:
OBJ:
20. ANS:
OBJ:
C
1
B
3
C
2
D
1
B
2
B
2
B
2
C
3
B
1
A
1
B
2
A
1
A
1
B
1
C
2
B
1
B
2
C
3
D
3
B
1
PTS:
STA:
PTS:
STA:
PTS:
STA:
PTS:
STA:
PTS:
STA:
PTS:
STA:
PTS:
STA:
PTS:
STA:
PTS:
STA:
PTS:
STA:
PTS:
STA:
PTS:
STA:
PTS:
STA:
PTS:
STA:
PTS:
STA:
PTS:
STA:
PTS:
STA:
PTS:
STA:
PTS:
STA:
PTS:
STA:
1
4.PS.5
1
4.PS.5
1
4.PS.5
1
4.PS.5
1
4.PS.5
1
4.PS.5
1
4.PS.5
1
4.PS.5
1
4.PS.5
1
4.PS.5
1
4.PS.5
1
4.PS.5
1
4.PS.5
1
4.PS.5
1
4.PS.5
1
4.PS.5
1
4.PS.5
1
4.PS.5
1
4.PS.5
1
4.PS.5
DIF: 1
REF: 1
DIF: 1
REF: 1
DIF: 1
REF: 2
DIF: 2
REF: 3
DIF: 1
REF: 3
DIF: 2
REF: 3
DIF: 1
REF: 3
DIF: 1
REF: 1
DIF: 2
REF: 2
DIF: 1
REF: 2
DIF: 2
REF: 3
DIF: 2
REF: 3
DIF: 1
REF: 1
DIF: 1
REF: 2
DIF: 2
REF: 3
DIF: 1
REF: 1
DIF: 1
REF: 1
DIF: 1
REF: 1
DIF: 2
REF: 2
DIF: 2
REF: 2
COMPLETION
21. ANS: free fall
PTS: 1
STA: 4.PS.5
22. ANS: momentum
DIF: 1
REF: 1
OBJ: 1
PTS: 1
STA: 4.PS.5
23. ANS: inertia
DIF: 1
REF: 3
OBJ: 1
PTS: 1
STA: 4.PS.5
24. ANS: free fall
DIF: 1
REF: 2
OBJ: 1
PTS: 1
DIF: 1
STA: 4.PS.5
25. ANS: centripetal force
REF: 1
OBJ: 2
PTS: 1
STA: 4.PS.5
26. ANS: velocity
DIF: 1
REF: 1
OBJ: 2
PTS: 1
DIF: 1
STA: 4.PS.5
27. ANS: projectile motion
REF: 1
OBJ: 1
PTS: 1
STA: 4.PS.5
28. ANS: gravity
DIF: 1
REF: 1
OBJ: 3
PTS: 1
STA: 4.PS.5
29. ANS: decreases
DIF: 1
REF: 1
OBJ: 3
PTS: 1
STA: 4.PS.5
30. ANS: third
DIF: 1
REF: 3
OBJ: 2
PTS: 1
STA: 4.PS.5
DIF: 1
REF: 3
OBJ: 2
PTS:
STA:
PTS:
STA:
DIF: 1
REF: 1
DIF: 1
REF: 1
MATCHING
31. ANS:
OBJ:
32. ANS:
OBJ:
F
2
D
2
1
4.PS.5
1
4.PS.5
33. ANS:
OBJ:
34. ANS:
OBJ:
35. ANS:
OBJ:
36. ANS:
OBJ:
B
1
C
3
A
1
E
1
PTS:
STA:
PTS:
STA:
PTS:
STA:
PTS:
STA:
1
4.PS.5
1
4.PS.5
1
4.PS.5
1
4.PS.5
DIF: 1
REF: 1
DIF: 1
REF: 1
DIF: 1
REF: 1
DIF: 1
REF: 1
37. ANS:
OBJ:
38. ANS:
OBJ:
39. ANS:
OBJ:
40. ANS:
OBJ:
E
1
C
2
B
1
D
3
PTS:
STA:
PTS:
STA:
PTS:
STA:
PTS:
STA:
1
4.PS.5
1
4.PS.5
1
4.PS.5
1
4.PS.5
DIF: 1
REF: 1
DIF: 1
REF: 2
DIF: 1
REF: 2
DIF: 1
REF: 2
SHORT ANSWER
41. ANS:
The car changes direction, but because of inertia your body tends to continue traveling forward. Thus, you are
pressed against the right side of the car.
PTS: 1
DIF: 3
REF: 1
STA: 4.PS.5
42. ANS:
p = 45 kg  10.0 m/s east = 540 kg • m/s east
OBJ: 1
PTS: 1
DIF: 2
REF: 3
OBJ: 1
STA: 4.PS.5
43. ANS:
when the upward force of air resistance equals the downward force of gravity
PTS: 1
STA: 4.PS.5
DIF: 1
REF: 1
OBJ: 1
PROBLEM
44. ANS:
p=m
p = 0.151 kg  43.1 m/s 5 6.51 kg • m/s
The baseball’s momentum after the pitch is 6.51 kg • m/s.
PTS: 1
STA: 4.PS.5
OTHER
DIF: 2
REF: 3
OBJ: 1
45. ANS:
D
PTS: 1
46. ANS:
A
PTS: 1
STA: 4.PS.2
DIF: 1
REF: 1
OBJ: 2
DIF: 1
REF: 1
OBJ: 2