Fundamentals of Physics Extended (10th Edition)

Published by Wiley
ISBN 10: 1-11823-072-8
ISBN 13: 978-1-11823-072-5

Chapter 5 - Force and Motion-I - Questions - Page 116: 10b

Answer

Force $F_{21}$ is accelerating 12kg to the right.

Work Step by Step

The normal force from block 1 to block 2 is only accelerating blocks 2 and 3. The sum of these two masses is the total mass that is being accelerated to the right by $F_{21}$
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