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Provides examples to describe levers as simple machines used to lift, push, or move a load. Includes an activity.

Learn about the different uses of levers. How does it work and why? These fun science books answer kids' questions about the world around them-and encourage the

Provides examples showing how screws are simple machines that make joining things together and moving, easier.

Explains how and why ramps and other inclined planes are used in everyday life.

Describes many different kinds, uses, and benefits of pulleys. Provides examples of pulleys by showing a flagpole, a crane, an elevator and window blinds.