Conceptual Physics (12th Edition)

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

Chapter 7 - Think and Explain: 94

Answer

An inefficient machine transforms some of the input energy into non-useful forms of energy (for example, a motor lifting a load might get hot). The total energy stays the same and is not “lost”; some energy is just unavailable.
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