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MOMENTUM AND IMPULSE WORKSHEET
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) west
4) south
NAME__________________
8. Base your answer to the following question on the
information and diagram below.
Block A moves with a velocity of 2
meters per second to the right, as shown in
the diagram, and then collides elastically
with block B, which is at rest. Block A
stops moving, and block B moves to the
right after the collision.
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. Two rocks weighing 5 Newtons and 10 Newtons,
respectively, fall freely from rest near the Earth's
surface. After 3 seconds of free-fall, compared to
the 5-newton rock, the 10-newton rock has greater
1) speed
3) momentum
2) acceleration
4) height
5. Momentum may be expressed in
1) joules
3) watts
2) kg-m/s
4) N-m
6. Which object has the greatest momentum?
1) a 12-kg mass moving at 1 m/sec
2) a 5-kg mass moving at 2 m/sec
3) a 9-kg mass moving at 3 m/sec
4) a 4-kg mass moving at 4 m/sec
7. Cart A has a mass of 2 kilograms and a speed of 3
meters per second. Cart B has a mass of 3
kilograms and a speed of 2 meters per second.
Compared to the inertia and magnitude of
momentum of cart A, cart B has
1) the same inertia and the same magnitude of
momentum
2) the same inertia and a smaller magnitude of
momentum
3) greater inertia and the same magnitude of
momentum
4) greater inertia and a smaller magnitude of
momentum
If block A is stopped in 0.1 second, the average
force acting on block A is
1) 50 N
3) 200 N
2) 100 N
4) 400 N
9. 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) 0.20 kg-m/sec due west
2) 5.0 kg-m/sec due east
3) 45 kg-m/sec due east
4) 45 kg-m/sec due west
10. A 1.0-kilogram mass changes speed from 2.0
meters per second to 5.0 meters per second. The
change in the object's momentum is
1) 9.0 kg-m/sec
3) 3.0 kg-m/sec
2) 21 kg-m/sec
4) 29 kg-m/sec
11. A 20.-kilogram mass moving at a speed of 3.0
meters per second is stopped by a constant force of
15 Newtons. How many seconds must the force act
on the mass to stop it?
1) 0.20 sec
3) 5.0 sec
2) 1.3 sec
4) 4.0 sec
12. A net force of 12 Newtons acting north on an
object for 4.0 seconds will produce an impulse of
1) 48 kg-m/sec north
3) 3.0 kg-m/sec north
2) 48 kg-m/sec south
4) 3.0 kg-m/sec south
13. A 5.0-kilogram cart moving with a velocity of 4.0
meters per second is brought to a stop in 2.0
seconds. The magnitude of the average force used
to stop the cart is
1) 20. N
3) 10. N
2) 2.0 N
4) 4.0 N
16. A 0.025-kilogram bullet is fired from a rifle by an
unbalanced force of 200 Newtons. If the force acts
on the bullet for 0.1 second, what is the maximum
speed attained by the bullet?
1) 800 m/s
3) 5 m/s
2) 20 m/s
4) 400 m/s
14. A 5.0-newton force imparts an impulse of 15
Newton- seconds to an object. The force acted on
the object for a period of
1) 0.33 s
3) 3.0 s
2) 20. s
4) 75 s
17. A force of 20. Newtons is exerted on a cart for 10.
seconds. How long must a 50.-newton force act to
produce the same impulse?
1) 10. s
3) 5.0 s
2) 2.0 s
4) 4.0 s
15. 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
18. A student drops two eggs of equal mass
simultaneously from the same height. Egg A lands
on the tile floor and breaks. Egg B lands intact,
without bouncing, on a foam pad lying on the floor.
Compared to the magnitude of the impulse on egg
A as it lands, the magnitude of the impulse on egg B
as it lands is
1) less
3) the same
2) greater
Answer Key
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