5021110
9781403485960
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How are a jack-in-the-box, door lock, and umbrella alike? How can a spring help you weigh a fish you've just caught? How can springs help you get somewhere on time? What kind of spring can lift you in the air? This book shows you how different kinds of these simple machines are all around you to make your work and play easier.Glover, David is the author of 'Springs' with ISBN 9781403485960 and ISBN 1403485968.
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