Physics UNIT 3 Multiple Choice

C

A

C

B

D

B

C

C

B

B

A

C

11. C

12. D

13. B

Which situations from the list is mechanical energy conserved

1. A ball slides down a hill with friction

2. The moon orbits the earth

3. A child swings on a frictionless swing, ignoring air resistance

4. An ice skater glides along the ice

5. A ball is dropped from a certain height and bounces back to a lower height

6. A ball slides down a frictionless hill

2, 3, 4, and 6

Adam and Bobby are twins who have the same weight. Adam drops to the ground from the tree at the same time that Bobby begins his decent down a frictionless slide. If they both start at the same height above the ground, how do their kinetic energies compare when they hit the ground.