Ramps and Wedges (Machines in Action) Book PDF, ePub eBook

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Book Descriptions:
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.

Ramps and Wedges (Machines in Action) by Angela Royston

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