Levers

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Levers by Royston, Angela, 9781403440846
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  • ISBN: 9781403440846 | 1403440840
  • Cover: Paperback
  • Copyright: 4/1/2003

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How does paddling move a boat forward? Why does a wheelbarrow have only one wheel? What does a counterweight do? Levers are simple machines that can be used to make other machines work. When you used a shovel, play on a seesaw, or use a bottle opener you are using lever. Levers explains what levers are and how they help you do everyday things.
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