College Physics (4th Edition)

Published by McGraw-Hill Education
ISBN 10: 0073512141
ISBN 13: 978-0-07351-214-3

Chapter 2 - Multiple-Choice Questions - Page 62: 2


(b) all add to zero.

Work Step by Step

The correct answer is: (b) all add to zero. According to Newton's third law, every force has an equal and opposite force. Suppose that object A exerts a force on object B and let's assume that this force is an internal force in the system. The internal force exerted on object A by object B is the interaction partner of the force exerted on object B by object A. These two forces are equal in magnitude and opposite in direction. Therefore, the sum of these two forces add to zero. Since every internal force in a system has an interaction partner that is also an internal force in the system, the sum of the internal forces all add to zero.
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