Work - Energy Theorem Worksheet Name ______

Physical Science Period _____ Date ______

Make sure to show all your work!

1. Calculate the KE of a 3.4 kg object moving at 4.6 m/s.

2. Calculate the mass of an object with a speed of 5.2 m/s and KE of 250 J.

3. If a 500 kg car has 312,500 J of KE, how fast is the car moving?

4. A 25 kg boulder sits on top of a 500 m high mountain. How much PE does the boulder have?

5. How high does a 50 kg person have to be to have a PE of 784,000 J?

6. A force of 60 N is exerted on a car. If the car was moved 2.5 m, how much work was done?

7. How far would a sled move if 2000 J of work energy was provide by 85 N of force?

8. How much work does gravity do when a 45 kg object falls 125 m?

9. How much work is done by a force of 500 N on an object that was moved only 0.5 m? 10. How much KE does a 5 kg rock have after that rock has fallen from 15 m to 9 m?

11. The tops of the towers of the Golden Gate Bridge, in San Francisco, are 227 m above the water. Suppose a worker drops a 655 g wrench initially at rest from the top of a tower. What will the velocity of the wrench be when it hits the water?

12. A 500 kg car is moving at 28 m/s. The driver sees a barrier ahead . If the car takes 95 m to come to rest. What is the magnitude of the minimum average force necessary to stop?

13. A 2.5 g bullet traveling at 350 m/s hits a tree and slows uniformly to a stop while penetrating a distance of 12 cm into the tree’s trunk. What force was exerted on the bullet in bringing it to rest?

If a 25 kg object has enough KE for it and a 85 kg object moving at 7 m/s to stop in a head-on collision, how fast is the 25 kg object moving, and how much KE does it have?