Essential University Physics: Volume 1 (4th Edition)

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

Chapter 8 - For Thought and Discussion - Page 146: 10



Work Step by Step

Both of these orbits involve circular motion. Thus, the sun is exerting a centripetal force, which is by definition perpendicular to the path of the planet. Since only forces with a component parallel to the motion of an object do work, no work is done.
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