1. Unit 4 Review

2. What is an inelastic collision? What is an elastic collision?

4. What is the momentum of a 15-kg ball rolling 5 m/s down a hill?

5. How fast would a 16.3 kg object be moving if its momentum is 87.9 kgm/s?

6. What is the impulse of a 5000 kg truck that is traveling at 10 m/s and then increases its speed to 30 m/s?

7. If a 100 kg boulder's speed increases from 2.5 m/s to 5 m/s in 3 seconds, how much force is applied to the boulder?

8. Two clay balls are rolled toward one another and stick together, elastic or inelastic?

9. A 5 kg object is rolled at 6 m/s towards a 7 kg object that is at rest. If they stick together, what is the new velocity of the combined mass?

10. A 0.5 kg object is rolled at 3 m/s towards a 1 kg object that is rolled at -5 m/s. They collide and bounce off of one another. If the 0.5 kg objects new velocity is -4 m/s, what is the new velocity of the 1 kg object?

11. A 0.145 kg baseball is pitched at a batter at 90 mph. The ball is hit back the other way at 65 mph, what is the impulse of the ball? If the contact with the bat is 0.01 seconds, how much force does the bat apply to the ball?

12. A bicyclist pedaling up a hill An archer with his bow drawn Sitting in the top of a tree A bowling ball rolling down the alley

13. Missy Diwater, the former platform diver for the Ringling Brother's Circus had a kinetic energy of 15,000 J just prior to hitting the bucket of water. If Missy's mass is 50 kg, then what is her speed?

14. A cart is loaded with a brick and pulled at constant speed along an inclined plane to the height of a seat-top. If the mass of the loaded cart is 3.0 kg and the height of the seat top is 0.45 meters, then what is the potential energy of the loaded cart at the height of the seat-top

15. The potential energy of a 40-kg cannon ball is 14000 J. How high was the cannon ball to have this much potential energy?

16. You are on roller blades on top of a small hill. Your potential energy is equal to 1,000.0 joules. The last time you checked your mass was 60.0 kilograms. a. What is your weight in newtons? b. What is the height of the hill?

17. What is the velocity of a 500-kilogram elevator that has 4,000 joules of energy?

18. You must exert a force of 4.5 N on a book to slide it across a table. If you do 2.7 J of work in the process, how far have you moved the book?

19. Another engine reaches its top speed from rest in 7.5 s. It is able to perform 250,000 J of work in that time. How much power does this engine have in that time?

20. How much work is done on a small car if a 3150 N force is exerted to move it 75.5 m to the side of the road?