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Chapter 6, Momentum and Collisions
71
C
HAPTER
6
6.1 Momentum and Impulse
1. A valid unit for momentum is which of the following?
a. kg
⋅
m/s
2
b. kg/m
2
c. kg
⋅
m/s
d. N
⋅
m
2. The dimensional equivalent of the quantity impulse in terms of the fundamental quantities
(mass, length, time) is which of the following?
a. MLT

1
b. ML
2
T

2
c. MLT
d. MLT

2
3. A 75kg swimmer dives horizontally off a 500kg raft. The diver’s speed immediately after
leaving the raft is 4.0 m/s. A microsensor system attached to the edge of the raft measures the
time interval during which the diver applies an impulse to the raft just prior to leaving the raft
surface. If the time interval is read as 0.20 s, what is the
magnitude of the average horizontal
force by diver on the raft?
a. 900 N
b. 450 N
c. 525 N
d. 1 500 N
4. A 0.12kg ball is moving at 6 m/s when it is hit by a bat, causing it to reverse direction and
have a speed of 14 m/s. What is the change in the magnitude of the momentum of the ball?
a. 0.39 kg
⋅
m/s
b. 0.42 kg
⋅
m/s
c. 1.3 kg
⋅
m/s
d. 2.4 kg
⋅
m/s
5. The impulse experienced by a body is equivalent to its change in:
a. velocity.
b. kinetic energy.
c. momentum.
d. None of the above choices are valid.
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72
6. The dimensional equivalence of the quantity “momentum” in terms of the fundamental
quantities (mass, length, time) is:
a. MLT

1
.
b. ML
2
T

2
.
c. MLT.
d. MLT

2
.
7. Alex throws a 0.15kg rubber ball down onto the floor. The ball’s speed just before impact is
6.5 m/s, and
just after is 3.5 m/s. What is the change in the magnitude of the ball’s
momentum?
a. 0.09 kg
⋅
m/s
b. 1.5 kg
⋅
m/s
c. 4.3 kg
⋅
m/s
d. 126 kg
⋅
m/s
8. Alex throws a 0.15kg rubber ball down onto the floor. The ball’s speed just before impact is
6.5 m/s, and
just after is 3.5 m/s. If the ball is in contact with the floor for 0.025 s, what is the
magnitude of the average force applied by the floor on the ball?
a. 60 N
b. 133 N
c. 3.0 N
d. 3.5 N
9. A crane drops a 0.30 kg steel ball onto a steel plate. The ball’s speeds just before impact and
after are 4.5 m/s and 4.2 m/s, respectively. If the ball is in contact with the plate for 0.030 s,
what is the magnitude of the average force that the ball exerts on the plate during impact?
a. 87 N
b. 133 N
c. 3.0 N
d. 3.5 N
10. Jerome pitches a baseball of mass 0.20 kg. The ball arrives at home plate with a speed of 40
m/s and is batted straight back to Jerome with a return speed of 60 m/s. What is the magnitude
of change in the ball’s momentum?
a. 4.0 kg
⋅
m/s
b. 8.0 kg
⋅
m/s
c. 18 kg
⋅
m/s
d. 20 kg
⋅
m/s
Chapter 6, Momentum and Collisions
73
11. Lonnie pitches a baseball of mass 0.20 kg. The ball arrives at home plate with a speed of 40
m/s and is batted
straight back to Lonnie with a return speed of 60 m/s. If the bat is in contact
with the ball for 0.050 s, what is the impulse experienced by the ball?
a. 360 N
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 Fall '09
 isac
 Physics, Momentum

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