Essential University Physics: Volume 1 (4th Edition)

Published by Pearson
ISBN 10: 0-134-98855-8
ISBN 13: 978-0-13498-855-9

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



Work Step by Step

Consider two peaks, where we define the top of each peak (which is the same height) to be ground level. If a ball roles off of the first peak, down a hill, and then up a hill to the second peak, it will have experienced forces such as gravity since it will have sped up. However, the potential energy at both points is still 0.
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