Fundamentals of Physics Extended (10th Edition)

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

Chapter 8 - Potential Energy and Conservation of Energy - Problems: 43b

Answer

The increase in the thermal energy of the bed and floor $=3.5$ $J$

Work Step by Step

The increase in the thermal energy of the bed and floor is equal to the work done by the kinetic frictional force. So, frictional work = kinetic frictional force $\times$ displacement of box $= 5N\times 0.7m$ $= 3.5$ $Joules$
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