## Physics for Scientists and Engineers: A Strategic Approach with Modern Physics (4th Edition)

Published by Pearson

# Chapter 7 - Newton's Third Law - Conceptual Questions - Page 176: 13

#### Answer

The force of the string on block B is smaller than the force of the hand on A.

#### Work Step by Step

Consider the free-body diagram for block A. The force from the hand $F$ and the tension $T$ are the two horizontal forces acting on block A. Since block A accelerates in the direction of the hand's force $F$, then $F$ must be greater in magnitude then $T.$ Note that $T$ is the force of the string on block B. Therefore, the force of the string on block B is smaller than the force of the hand on A.

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