Simple machines

Photographs and text teach young readers about different types of screwdrivers and their uses.

Text and pictures introduce the pulley, a simple machine used primarily to lift heavy objects.

Text and pictures introduce the lever, a simple machine used to change force and motion.

Text and pictures introduce the inclined plane, a simple machine consisting of a slanted surface or ramp to make work easier.

An introduction to wedges that describes their parts, functions, uses, and history.

An introduction to screws that describes their parts, functions, uses, and history.

An introduction to pulleys that describes their parts, functions, uses, and history.

An introduction to inclined planes that describes their parts, functions, uses, and history.

An introduction to wheels and axles, explaining what they are, and looking at examples of how they are used.

Looks at wheels as simple machines, discusses the need for an axle to make wheels work effectively, examines the mechanical advantages of using wheels, explains the concept of friction, and describes various wheeled machines.