Physics - Chapter 6 Study Guide

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1. Define each of the following:
        a) elastic collision
        b) inelastic collision
        c) perfectly inelastic collision

2. What is the relationship of the momentum of two objects of different mass if they have the same velocity?

3. What is the relationship of the momentum of two objects with the same mass if they have different velocities?

4. What is the change in an object’s momentum equal to in terms of mass and velocity and in terms of force and time?

5. A force is required to stop a moving object. What effect would increasing the time interval over which the force is applied have on the amount of force necessary?

6. A person standing on a skate board steps off of the skate board, causing the skate board to roll backwards. What happens to the momentum of the skate board?

7. What is the impulse experienced by an object equivalent to?

8. Why will a glass break when dropped directly on a floor, but does not break when dropped on a piece of foam rubber placed on the floor?

9. If two objects collide, what is the relationship between the momentums of the two objects before and after collision?

10. Two children on stand facing each other on ice. One of the children’s mass is 40 kg , and the other’s mass is 37 kg. What happens to their momentum if they push away from each other?

11. Explain conservation of momentum.

12. A 73 kg fisherman steps out of his 256 kg boat. If the fisherman’s velocity is 2.1 m/s immediately after leaving his boat, what is the speed of the boat?

13. A bullet with a mass of 4.97 x 10^!3 kg is loaded into a gun. The loaded gun has a mass of 0.68 kg. The bullet is fired, causing the empty gun to recoil at a speed of 1.9 m/s. What is the speed of the bullet?

14. A 65.0 kg boater in a 198 kg boat on a calm lake loses his paddle. To return to the shore the boater throws a 25 kg box of supplies away from the shore at a speed of 13.9 m/s. At what speed does the boater move toward the shore?

15. What velocity must a 475 kg motorcycle have in order to have the same momentum as a 74.7 kg man running with a velocity of 5.76 m/s?

16. A 0.145 kg baseball traveling at a speed of 35.3 m/s is hit by a bat, causing it to rebound in the opposite direction at a speed of 42.1 m/s. What is the change in the baseball’s momentum?

17. A 38 kg boy on a 59 kg bicycle is traveling at a speed of 12.6 m/s. Seeing that he is about to crash, the boy jumps off still traveling at a speed of 7.3 m/s. What is the velocity of the bicycle after the boy jumps off?

18. A 1.5 x 10³ kg truck strikes a 7.5 x 10² kg automobile stopped at a traffic light. The vehicles hook bumpers and skid together at a speed of 10.0 m/s. What was the initial velocity of the truck?