University Physics with Modern Physics (14th Edition)

Published by Pearson
ISBN 10: 0321973615
ISBN 13: 978-0-32197-361-0

Chapter 4 - Newton's Laws of Motion - Problems - Discussion Questions - Page 123: Q4.30

Answer

Consider the system of person A, person B, and the rope. Then any force on the rope is an internal force in the system. There are two external horizontal forces acting on the system: 1. the force of friction from the ground pushing person A backwards. 2. the force of friction from the ground pushing person B backwards. Whichever one of these two forces is greater will determine who wins the tug-of-war.

Work Step by Step

Consider the system of person A, person B, and the rope. Then any force on the rope is an internal force in the system. There are two external horizontal forces acting on the system: 1. the force of friction from the ground pushing person A backwards. 2. the force of friction from the ground pushing person B backwards. Whichever one of these two forces is greater will determine who wins the tug-of-war.
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