Conceptual Physics (12th Edition)

Published by Addison-Wesley
ISBN 10: 0321909100
ISBN 13: 978-0-32190-910-7

Chapter 7 - Think and Solve: 42


a. F d = (100 N)(10 m) = 1000 J of work. b. Because of friction, the net work done on the crate is less. $$\Delta KE = Net \;work = net \;force \cdot distance = (100 N – 70 N)(10 m) = 300 J$$ c. The remainder, 700 J, transforms into thermal energy and heats the crate, floor, and surroundings.
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