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Get to know wheels and axles / Paul Challen.

by Challen, Paul C. (Paul Clarence), 1967-

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Crabtree Pub. Company, c2009.

Wheels -- Juvenile literature.

Axles -- Juvenile literature.

Simple machines -- Juvenile literature.

Get to know simple machines

9780778744887 (pbk. : alk. paper)

0778744884 (pbk. : alk. paper)

9780778744719 (reinforced library binding : alk. paper)

077874471X (reinforced library binding : alk. paper)

32 p. : ill. ; 29 cm.

Includes Internet addresses (p. 32) and index.

Wheels and axles -- The basic design -- How it works -- Wheel and axle in action -- Moving loads -- A multi-axle model -- A lifting machine -- Build a lifting machine -- Wheels and axles in action -- The fan in action -- Fighting friction -- How friction happens -- The wheel and axle as part of a complex machine -- Glossary.

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. This book focuses on the wheels and axles.

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