1454590
9781403400574
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How can pulling down make something go up? How do carnival rides work? What makes the hands on a watch go around? How does pedaling a bicycle make it move? This title shows you how different kinds of these two simple machines are all around you to make your work and play easier.David Glover is the author of 'Pulleys and Gears (Simple Machines, Heinemann)' with ISBN 9781403400574 and ISBN 1403400571.
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