pulleys

Explains the science of how pulleys and gears work, discussing real-life examples such as cranes, drive belts, drills, and mountain bikes, and includes activities that illustrate the principles covered.

Describes what pulleys are, how they work, and what they are used for in everyday life.

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

Discusses how pulleys work and gives examples of pulleys in action.

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

Explains the concepts of work, gravity, and friction, describes machines and different kinds of pulleys, and includes simple experiments.

An introduction to six simple machines--the lever, the inclined plane, the screw, the wheel and axle, the wedge, and the pulley--and their use in more complex machines such as derricks, bulldozers, and metal lathes.

Text and photographs look at basic devices such as wheels, pulleys, levers, screws, and slopes, and suggest simple experiments and projects to demonstrate how they work.

Text and illustrations describe pulleys, a simple machine.

Photographs and simple text describe various objects that are pulleys and how they work.