Conceptual Physics (12th Edition)

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

Chapter 6 - Think and Discuss: 91

Answer

When two objects in a system interact, they exert equal and opposite forces on each other, for the same time interval. The resulting impulses, I = Ft, are equal and opposite. In other words, their individual changes of momentum are equal and opposite. The change of momentum in the system is zero.
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