Question

Q 1. How does friction affect the mechanical energy of a system? Q 2. A roller coaster is at the stop of a hill and rolls to the top of a lower hill. If mechanical energy is constant, then on the top of which hill is the kinetic energy from the roller coaster motion greater?

Answer 1

Answer:

1. Friction lowers (decreases) the kinetic energy which in turn decreases the mechanical energy of a system.
2. At the top of the second hill.

Explanation: