Challen, Paul C. 1967-

Get to know wheels and axles / Paul Challen. - New York, NY : Crabtree Pub. Company, 2009. - 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: 077874471X (reinforced library binding : alk. paper) 9780778744887 (pbk. : alk. paper) 0778744884 (pbk. : alk. paper) 9780778744719 (reinforced library binding : alk. paper)

LCCN: 2009004588

Subjects--Topical Terms:
Wheels.
Axles.

LC Class. No.: TJ147 / .C45 2009

Dewey Class. No.: 621.8