"An introduction to the six simple machines-the screw, lever, wedge, pulley, inclined plane, and the wheel and axle-and examples of how they are used in real life"-- Provided by publisher.
Audience
Ages 4-8 Greenwillow Books, an imprint of HarperCollinsPublishers
Grades K-1 Greenwillow Books, an imprint of HarperCollinsPublishers