5021108
9781403485946
How are a water slide and a ski jump alike? Why is pushing something along a ramp much easier than lifting it in the air? Why do skis zigzag down a hill? How can a simple wedge stop an airplane? This book answers these questions and shows you how different kinds of these two simple machines are all around you to make your work and play easier.Glover, David is the author of 'Ramps and Wedges' with ISBN 9781403485946 and ISBN 1403485941.
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