Conceptual Physics (12th Edition)

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

Chapter 4 - Think and Explain: 75

Answer

This is discussed on page 63. Newton's second law relates force and acceleration. If there is no net force, the second law tells us there is no acceleration. The object either stays at rest, or keeps moving at constant velocity. We see that Newton’s first law is a special case of the second law, with net force = 0.
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