Answer
Though machines cannot create energy, they can increase force at the cost of decreasing the distance, or vice versa. As shown in the examples and applications, this is clearly useful.
Conceptual Physics (12th Edition)
by Hewitt, Paul G.
Published by
Addison-Wesley
ISBN 10:
0321909100
ISBN 13:
978-0-32190-910-7
Chapter 7 - Think and Discuss - Page 130-131: 106
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