Get to Know PulleysBook - 2009
All people have jobs to do. Some jobs take a lot of energy. Simple machines help people get jobs done without working too hard. There are six kinds of simple machines: inclined planes, levers, pulleys, wedges, screws, and wheels and axles.
Publisher: New York, NY : Crabtree Pub. Company, 2009
Branch Call Number: j 621 Volpe
Characteristics: 32 p. : col. ill. ; 29 cm
Alternative Title: Pulleys
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