Conservation of Momentum

Practice Problems
Momentum, Impulse, and Work

Topics: On this worksheet you will practice your knowledge of these concepts: Momentum, Impulse, and Work.

Page Directions The numerical values in this worksheet are randomly generated allowing students the opportunity to conveniently practice, and drill, common situations.

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In order to check an answer (even when you are just starting the worksheet on Question 1) it is necessary to omit

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Question 1 A 2.7-kg ball has a KE of 78 J. What is the ball's momentum?

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10.3 kg m/sec

17.7 kg m/sec

20.5 kg m/sec

156 kg m/sec

Question 2 A 48-kilogram skater at rest on a frictionless rink throws a 2.7-kilogram ball, giving the ball a velocity of 7.6 m/s. Which value describes the skater's subsequent motion?

-0.43 m/sec

-17.05 m/sec

-2.7 m/sec

-0.06 m/sec

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Question 3

A 4030-kg freight car moving at 7.6 m/sec collides and couples with an 10075-kg freight car which is initially at rest. The approximate common final speed of these two cars is

5.43 m/sec

10.64 m/sec

2.17 m/sec

3.04 m/sec

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26.6 m/sec

Question 4 A 4.8-g bullet moving at 333 m/sec is brought to a stop in 0.8 seconds when it strikes a tree. The average braking force exerted on the bullet by the tree is

there is not enough information to calculate the force

-1.28 N

-832.5 N

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-2 N

Question 5 You push two objects, both initially at rest, with the same amount of force through the same distance. Object A has mass, m, while object B has mass, 16m.

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B will gain 4 times as much momentum as A

B will gain 4 times as much KE as A

A will gain 4 times as much momentum as B

A will gain 4 times as much KE as B

Question 6 A heavy and a light object are released from the same height and fall to the ground. Just before they strike the ground, they will have

none of the other choices are true

gained the same kinetic energy

gained the same amount of momentum

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experienced the same force

Question 7 A girl jumps upward from the surface of the earth.

Does an external force act on system 'girl + earth'?

no, all forces in the diagram cancel each other and neither participant (girl and earth) is accelerated

yes, because each participant (girl and earth) will experience a change in its momentum

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yes, because each participant (girl and earth) will accelerate

no, the each participant (girl and earth) experience equal but opposite impulses and equivalent changes in momentum

Question 8 Running at 3.8 m/sec Jack, a 45-kg quarterback, collides with Leon, a 90-kg tackle, who is traveling towards him at 7.6 m/sec. Upon colliding, Leon continues to travel forward towards Jack, at 1.52 m/sec. How fast does Jack leave the collision?

-3.04 m/sec

15.96 m/sec

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1.52 m/sec

-8.36 m/sec

Question 9 In which picture does Bronco have the greatest terminal velocity?

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