Energy and action

Provides information about water, answering such questions as "Why does the water in the bathtub rise higher when you get in?" and "Why do some things sink and some float?".

Describes the nature of energy, where it comes from, and how it can be used.

Briefly describes the concepts, measurement, and laws of motion.

Text and photographs provide information for young readers about the scientific concepts of force, gravity, and friction.

Expalins the relationship between energy and work, as defined scientifically.

Describes simple machines and how they work, including the inclined plane, levers, wheels and axles, the wedge, screws, and pulleys.