



Unit 4 Quiz#1Equations:
1. What impulse will give a 2.0 kg mass a momentum change of +50 kg m/sec?
2. A golf ball moving forward with 1 unit of momentum strikes and bounces backward off a heavy bowling ball that is initially at rest and free to move. The bowling ball is set in motion with a momentum of ________________.
3. The quantity 1 kg m/sec is equivalent to
4. You're driving down the highway and a bug spatters into your windshield. Which undergoes the greater change is momentum?
5. A 1 kg ball hits a surface perpendicularly with a speed of 3 m/sec and bounces back with a speed of 2 m/sec. The ball undergoes a change in momentum of
6. A car with a mass of 1000 kg is moving with a speed of 140 m/sec. The impulse required to bring the car to rest is
7. A 2 N force acts on a mass. If the momentum of the mass changes by 120 kg m/sec, then the force acts for a time of
8. A body of mass 5.0 kg is moving on a smooth surface with a velocity of 6.0 m/sec to the right. A constant force is applied for 3.0 sec, giving the body a final velocity of 12 m/sec to the left. The applied force was
9. Impulses are smaller when bounces take place.
10. A firecracker falls through the air and explodes. In this example, momentum is not conserved.
11. The reason car dashboards are padded is to lengthen the time of impact in the case of a collision.
12. Which of the following has the largest momentum?
13. A freight train rolls along a track with considerable momentum. If it rolls at the same speed but has twice as much mass, its momentum is ________________.
14. In order to catch a ball, a baseball player moves his or her hand backward in the direction of the ball's motion. Doing this reduces the force of impact on the players hand principally because___________.
15. A car traveling along the highway needs a certain amount of force exerted on it to stop. More stopping force may be required when the car has ___________.
16. Paul D. Trigger fires a bullet. The speed of the bullet will be the same as the speed of the recoiling gun ______________.
17. A 2 kg ball is thrown at 3 m/sec. What is the ball's momentum?
18. A 4 kg ball has a momentum of 12 kg m/sec. What is the ball's speed?
19. A ball is moving at 4 m/s and has a momentum of 48 kg m/sec. What is the ball's mass?
20. Recoil is noticeable if we throw a heavy ball while standing on roller skates. If instead we go through the motions of throwing the ball but hold onto it, our net recoil will be _________________.
21. A heavy truck and a small car rolling down a hill at the same speed are forced to stop in the same amount of time. Compared to the force that stops the car, the force needed to stop the truck is ________________.
22. A piece of putty moving with 1 unit of momentum strikes and sticks to a heavy bowling ball that is initially at rest. After the putty sticks to the ball, both are set in motion with a combined momentum that is _______________.
23. A 1 kg chunk of putty moving at a 1 m/sec collides and sticks to a 5 kg bowling ball that is initially at rest. The bowling ball with its putty host is then set in motion with a momentum of ________________.
24. Two billiard balls having the same mass roll toward each other, each moving at the same speed. What is the combined momentum of the two balls?
25. A 1kg chunk of putty moving at 1 m/sec collides with and sticks to a 5kg bowling ball that is initially at rest. The bowling ball with its putty host is then set in motion with a speed of ____________.
© Tom Henderson, 19961998
