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Impulse and Momentum HW
1. What is the momentum of a 30-kilogram cart moving with a
speed of 10 meters per second?
1) 20 kg-m/sec
3) 3 kg-m/sec
2) 40 kg-m/sec
4) 300 kg-m/sec
2. If the direction of the velocity of an object is west, the
direction of the momentum of the object is
1) north
3) east
2) south
4) west
3. If a 3.0-kilogram object moves 10. meters in 2.0 seconds,
its average momentum is
1) 60. kg-m/sec
3) 15 kg-m/sec
2) 30. kg-m/sec
4) 10. kg-m/sec
4. Base your answer to the following question on the graph
below which represents the velocity-time relationship for a
2.0-kilogram mass moving along a horizontal frictionless
surface.
The momentum of the mass during interval BC is
1) 8.0 kg m/s
3) 0 kg m/s
2) 12 kg m/s
4) 4.0 kg m/s
5. Momentum may be expressed in
1) joules
3) kg-m/s
2) watts
4) N-m
6. Which of the following objects has the greatest momentum?
1) a 1-kg object moving at 200 m/sec
2) a 10-kg object moving at 30 m/sec
3) a 20-kg object moving at 20 m/sec
4) a 100-kg object moving at 2 m/sec
7. A mass with a momentum of 40. kg•m/s receives an
impulse of 30. N•s in the direction of its motion. The final
momentum of the mass is
1) 1.3 kg•m/s
3) 70. kg•m/s
2) 10. kg•m/s
4) 1,200 kg•m/s
8. A 2-newton force acts on a mass. If the momentum of the
mass changes by 120 kg-meters/sec., the force acts for a
time of
1) 8 sec.
3) 60 sec.
2) 30 sec.
4) 120 sec.
9. Base your answer to the following question on the diagram
below which represents a 10-kilogram object at rest at point
A. The object accelerates uniformly from point A to point B
in 4 seconds, attaining a maximum speed of 10 meters per
second at point B. The object then moves up the incline.
[Neglect friction.]
Compared to the impulse required to stop the object at point
B, the impulse required to stop the object at point C is
1) less
3) the same
2) greater
10. A 15-newton force acts on an object in a direction due east
for 3.0 seconds. What will be the change in momentum of
the object?
1) 45 kg-m/sec due east
3) 5.0 kg-m/sec due east
2) 45 kg-m/sec due west
4) 0.20 kg-m/sec due west
11. A force of 10. Newtons acts on an object for 0.010 second.
What force, acting on the object for 0.050 second, would
produce the same impulse?
1) 1.0 N
3) 5.0 N
2) 2.0 N
4) 10. N
12. As the unbalanced force applied to an object increases, the
time rate of change of the object's momentum
1) decreases
3) remains the same
2) increases