Every one knows, as a piece of school-boy acquirement, that the mechanical powers are the lever, the wheel and axle, the pulley, the inclined plane, the wedge and the screw. Very few people ...

A pulley is a wheel on a fixed axle. The wheels normally have a groove in them, to guide a rope or cable through. One end of the rope is attached to a load that needs to be lifted. Then the other ...

Explains how simple machines, such as levers, pulleys, wheels and axles, and inclined planes, work together to make tasks easier by trading force for distance or vice versa. It illustrates the concept ...