Conceptual Physics (12th Edition)

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

Chapter 5 - Think and Explain: 35

Answer

Steve and Gretchen are touching each other. You cannot physically contact a person without that person also being in contact with you. Whenever Steve exerts a force on Gretchen, we find that Gretchen exerts an equal and opposite force on Steve. This example is discussed on page 81.
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