Volpe, Karen.

Get to know pulleys / by Karen Volpe. - New York, NY : Crabtree Pub. Company, c2009. - 32 p. : col. ill ; 29 cm. - Get to know simple machines .

Includes index.

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.

ISBN: 077874468X 9780778744856 (pbk.) 077874485X (pbk.) 9780778744689

LCCN: 2009004585

Subjects--Topical Terms:
Pulleys.
Children's literature--2010.

LC Class. No.: TJ1103 / .V65 2009

Dewey Class. No.: 621.8