Essential University Physics: Volume 1 (4th Edition)

Published by Pearson
ISBN 10: 0-134-98855-8
ISBN 13: 978-0-13498-855-9

Chapter 4 - Section 4.6 - Newton’s Third Law - Got It? - Page 65: 4.5



Work Step by Step

It is less than 2N. After all, the net force on the overall system (the two blocks) is 2N. This gives them a constant acceleration. However, recall that $F_{12} = \frac{m_2}{m_1+ m_2} \times F$ Thus, the force on block two, the three kilogram block, will be less than the overall net force.
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