An introduction to pulleys and gears as simple machines. Coverage includes the kind of pulleys used by mountain climbers, how gears help cars and buses work and why weight lifters need pulleys to help them train.
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Details
ISBN: 1410914453 (lib. bdg.)
Physical Description:32 pages : color illustrations ; 28 cm.print
Publisher:Chicago, Ill : Raintree, c2005.
Bibliography, etc. Note: Includes bibliographical references (p. 30) and index.