Challen, Paul C. 1967-

Get to know screws / Paul Challen. - 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: 0778744698 9780778744863 (pbk. ) 0778744868 (pbk. ) 9780778744696

LCCN: 2009004586

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

LC Class. No.: TJ1338 / .C44 2009

Dewey Class. No.: 621.8/82