simple machines

Photographs and text introduce scientific concepts related to simple machines, describing the tools used to build ancient civilizations, and providing additional facts, statistics, and a time line of the simple tools used throughout history.

Explains the principles and describes the uses of such simple machines as the pulley, wedge, lever and others.

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.

Explains the physics principles at work in simple machines and presents science projects involving first-, second-, and third-class levers; the wheel and axle; wheels, bearings, and friction; inclined planes; the wedge; the screw or bolt; and single pulleys.

Presents experiments and tricks to demonstrate movements representing natural forces such as gravity, inertia, and friction, and those made by simple machines.

Introduces simple machines, including the different types of machines, how they function, and how they are used in more complex projects.

Text and illustrations describe the simple machine known as a lever.

TV's Don Herbert uses demonstrations and hands-on activities to teach scientific principles.

Describes the simple machines--lever, pulley, wedge, screw, inclined plane, and wheel and axle--and explains how they are utilized to make work easier.