Conceptual Physics (12th Edition)

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

Chapter 6 - Think and Explain: 77

Answer

By Newton’s third law, the bug and windshield exert equal and opposite forces on each other. These forces act for the same time interval, so the bug and the car undergo equal and opposite impulses, and hence, equal and opposite changes in momentum. The above argument assumes no external forces on the bug-car system.
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