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 D

Answer 1

A — The potential energy is greatest at X. As the ball rolls toward Y, that potential is converted into kinetic energy; if no non-conservative forces act, total mechanical energy stays constant.