Simple machines

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

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

Introduces the principles of wheels and cranks as simple machines, using examples from everyday life.

Introduces the principles of springs as simple machines, using examples from everyday life.

Introduces the principles of screws as simple machines, using examples from everyday life.

Uses a variety of examples, from scissors and axes to zippers and hairpin turns, to demonstrate the power of the inclined plane and show how ramps and wedges make work and play easier.

Introduces the principles of pulleys and gears as simple machines, using examples from everyday life.

Introduces pulleys and how they work to raise flags, as well as heavy objects.

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

Illustrations and text describe different examples of the use of simple machines known as levers.