wheels

Describes what wheels are and how they work, different types of wheels and their uses, and other facts about wheels.

Highlights the invention of the wheel and its importance and uses.

Describes what wheels are and how they work, different types of wheels and their uses, and other facts about wheels.

Describes different kinds of wheels and what they do.

Introduces young readers to wheels and axles, explaining what they are, how they work, what they have been used for throughout history, and how they might be used in the future.

Introduces the wheel and axle as a simple machine that can make it easier to move heavy objects, as well as to flatten dough.

Explains the workings of simple machines, including levers, wheels and axles, pulleys and cranes, and gears, and features related experiments.

Text and pictures introduce the wheel, a simple machine used primarily to make it easy to move heavy loads.

An exploration of wheels and axles that defines what they are; discusses their parts, how they work, their history, and how they are used; and includes a related experiment.

A photographic introduction towheels and axles for beginning readers, explaining what they are and how they work, looking at examples of wheels and axles, and discussing their use in complex machines.