Essential University Physics: Volume 1 (4th Edition)

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

Chapter 7 - Section 7.4 - Nonconservative Forces - Got It? - Page 123: 7.4

Answer

1) a 2) a and c

Work Step by Step

Mechanical energy is conserved only when the only forces acting on the object are conservative, making a) the correct answer. Overall energy in the system is conserved when no work is done on the system, and this occurs in cases a and c. NOTE: energy in the universe is ALWAYS conserved. They say the systems are isolated in a and c to specify that there is no energy lost to surroundings.
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