Get to know pulleys / ; By Volpe, Karen.

Format: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.
Copyright:2009
ISBN:077874468X | 9
LCCN:2009004585
Publisher:New York, NY : Crabtree Pub. Company,
Physical Details: 32 p. : col. ill ; 29 cm.
Notes:Includes index.
Record No.:297953
Type/Format Call Number Location Due Date Last Seen Barcode
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