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

Help students think while they read in all subject areas, with the key skills of connecting, questioning, visualizing, inferring, and synthesizing.

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

Discusses wheels and axles, what they are and how they are used.

Discusses what a screw is and how it is used.

Discusses what wedges are and how they are used.

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