Essential University Physics: Volume 1 (3rd Edition)

Published by Pearson
ISBN 10: 0321993721
ISBN 13: 978-0-32199-372-4

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