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.

Before beginning any given worksheet, please look over all of the questions and make sure that there are no duplicate answers shown for the same question. If duplicates are present simply refresh the page until every answer is unique.

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

any questions that you have not answered. Once you start submitting answers, the page may be checked as many times as necesasary without changing the randomized answers. Relevant scoring will be provided at the top of the page only when you answer all of the questions on your original submission.

		Question 1 A 1.9-kg ball has a KE of 95 J. What is the ball's momentum?
190 kg m/secomit9.5 kg m/sec19.5 kg m/sec19 kg m/sec

		Question 2 A 75-kilogram skater at rest on a frictionless rink throws a 1.9-kilogram ball, giving the ball a velocity of 10 m/s. Which value describes the skater's subsequent motion?
-0.25 m/sec-7.89 m/secomit-0.07 m/sec-14.25 m/sec

		Question 3 A 5070-kg freight car moving at 10 m/sec collides and couples with an 12675-kg freight car which is initially at rest. The approximate common final speed of these two cars is
omit4 m/sec35 m/sec14 m/sec2.86 m/sec7.14 m/sec

		Question 4 A 7.5-g bullet moving at 316 m/sec is brought to a stop in 1 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-2.37 Nomit-632 N-2.37 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, 9m.
B will gain 3 times as much momentum as AB will gain 3 times as much KE as AA will gain 3 times as much KE as BomitA will gain 3 times as much momentum 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
experienced the same forceomitgained the same kinetic energygained the same amount of momentumnone of the other choices are true

		Question 7 A girl jumps upward from the surface of the earth. Does an external force act on system 'girl + earth'?
yes, because each participant (girl and earth) will accelerateno, the each participant (girl and earth) experience equal but opposite impulses and equivalent changes in momentumno, all forces in the diagram cancel each other and neither participant (girl and earth) is acceleratedyes, because each participant (girl and earth) will experience a change in its momentumomit

		Question 8 Running at 5 m/sec Jack, a 45-kg quarterback, collides with Leon, a 90-kg tackle, who is traveling towards him at 10 m/sec. Upon colliding, Leon continues to travel forward towards Jack, at 2 m/sec. How fast does Jack leave the collision?
omit2 m/sec-4 m/sec21 m/sec-11 m/sec

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