Apr 4, 2015
Simple machines is a device that has few or no moving parts and makes the work easier or faster. Work is using force to move an object across a distance.
Using a longer rope wound around more than one pulley makes lifting easier.
Aug 11, 2015
Like other simple machines,
A Pulley is a simple machine made up of a wheel and a rope. ... We use pulleys
because they let you move loads up, down or sidways. ...