Physics for Scientists and Engineers: A Strategic Approach with Modern Physics (3rd Edition)

Published by Pearson
ISBN 10: 0321740904
ISBN 13: 978-0-32174-090-8

Chapter 7 - Newton's Third Law - Exercises and Problems: 15

Answer

(a) A force of 20 N pulls forward on the ice. (b) A force of 21 N pulls forward on the rope.

Work Step by Step

(a) Let $F_i$ be the force that pulls forward on the ice. We can find the magnitude of $F_i$. Let $m_i$ be the mass of the ice. $F_i = m_i~a$ $F_i = (10~kg)(2.0~m/s^2)$ $F_i = 20~N$ A force of 20 N pulls forward on the ice. (b) Let $F_r$ be the force that pulls forward on the rope. We can find the magnitude of $F_r$. Let $m_i$ be the mass of the ice. Let $m_r$ be the mass of the rope. $F_r = (m_i+m_r)~a$ $F_r = (10~kg+0.50~kg)(2.0~m/s^2)$ $F_r = 21~N$ A force of 21 N pulls forward on the rope.
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