Conceptual Physics (12th Edition)

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

Chapter 7 - Think and Explain - Page 129-130: 93


Scissors, metal-cutting shears, and bolt cutters are levers. Input force multiplied by input distance equals output force multiplied by output distance. For scissors that cut paper, with their short handles, a relatively large force acts over a small distance, and the lever turns it into a small force over a long distance. On the other hand, to cut metal or to shear bolts, the handles are long. A relatively small force is applied over a long distance to output a large force over a short distance. This is discussed on page 120.
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