Screws (Simple Machines)
Released: Sep 15, 2005
Publisher: Heinemann/Raintree
Format: Library Binding, 24 pages
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Description:
How are a boat propeller, water faucet, and spiral staircase alike? How can a screw keep your soda pop from getting flat? How can a screw help you plant a tree? Why might a large wrench work better than a small one? This title shows you how different kinds of these simple machines are all around you to make your work and play easier.
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