Conservation of Energy – AP Physics 1

1. A 3 kg ball is released from 4 m height. What is its speed at the bottom (no friction)?

6.26 m/s 8.85 m/s 9.8 m/s 12.0 m/s

2. At the lowest point of a frictionless ramp, which statement is true?

PE is maximum, KE is zero KE is maximum, PE is zero KE = PE Total energy is zero

3. If friction acts, what happens to total mechanical energy?

It increases It stays constant It decreases (converts to thermal) It oscillates