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Simple Machines

by Murphy, Patricia J

$7.39

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Description

Though most of us don't think about it very often, simple machines are all around us, from ramps and levers to wheels and axles. They make our lives easier in many ways. It would be awfully difficult to ride a bike without the wheel and axle. Readers find out how some of our favorite simple machines work, and how they have changed our world.

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Product Details

  • Dec 30, 2005 Pub Date:
  • 082398219X ISBN-10:
  • 9780823982196 ISBN-13:
  • English Language
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