Ramps and Wedges

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Ramps and Wedges by Royston, Angela, 9781403440860
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  • ISBN: 9781403440860 | 1403440867
  • Cover: Paperback
  • Copyright: 4/1/2003

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Why do skiers use a zigzag path down steep slopes? How does a zipper work? How does a lock work? Ramp and wedges are simple machines that can be used to make other machines work. When you open a lock, cut something with scissors, zip up your coat, or use a doorstop you are using ramps or wedges. Ramps and Wedges explains what these machines are and how they help you do everyday things.
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