Douglas, Lloyd G.

What Is a Pulley? / Lloyd G. Douglas - New York Children's Press c2002 - 24 p. illus. - Simple Machines .

Added to collection April 2006 from Scholastic Book Fair profits.

Includes bibliographical references (p. 23) and index. Introduces pulleys and how they work to raise flags, as well as heavy objects.

ISBN: 0516240242 (pbk)

Subjects--Topical Terms:
Pulleys
Grade 2 science theme relative position and motion