## Essential University Physics: Volume 1 (4th Edition)

Published by Pearson

# Chapter 7 - For Thought and Discussion - Page 130: 6

No

#### Work Step by Step

The force does not necessarily have to be 0. As a matter of fact, the zero of potential energy is whatever we decide to define it as, so the fact that we define potential energy to be 0 at a given point to be 0 does not mean the force is 0. For instance, if I throw a ball up, I could define the zero of potential energy as the peak of the flight path. However, the force would not be 0 at the peak of the flight, for the ball would not come back down to the ground.

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