Physics (10th Edition)

Published by Wiley
ISBN 10: 1118486897
ISBN 13: 978-1-11848-689-4

Chapter 4 - Forces and Newton's Laws of Motion - Focus On Concepts - Page 111: 1


b) cannot be true.

Work Step by Step

Since the object is moving at a constant velocity, it has no acceleration, which means $\sum F=0$ $\sum F=0$ when either no forces are acting on the object or all the forces acting on the object have balanced one another. In b), when a single force $F$ acts on the object, it is not balanced by any other forces, so $\sum F=F\ne0$, so b) cannot be true.
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