Conceptual Physics (12th Edition)

Published by Addison-Wesley
ISBN 10: 0321909100
ISBN 13: 978-0-32190-910-7

Chapter 5 - Think and Discuss: 74


There are three action-reaction forces. 1. Action: foot exerts force on ball. Reaction: ball exerts force on foot. 2. Action: Earth pulls down on ball. Reaction: ball pulls up on the Earth. 3. Action: support force from floor pushes ball upward. Reaction: ball pushes floor downward. The action force in each action-reaction pair has the same magnitude as the reaction force and the two are oppositely directed, according to Newton’s third law.
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