Question

The diagram shows a ball resting at the top of a hill.

A ball is at the top of a slope at point X. The bottom of the slope is point Y.
Which statement best describes the energy in this system?

The potential energy in the system is greatest at X.
The kinetic energy in the system is greatest at X.
Total energy in the system decreases as the ball moves from X to Y.
Total energy in the system increases as the ball moves from X to Y.
A B C or D

Answer 1

A

The ball has the greatest gravitational potential energy at the highest point X. As it rolls toward Y that potential is converted into kinetic energy (kinetic is greatest at Y). If no friction or air resistance is present, total mechanical energy stays constant.