So you've got a heavy load, and you want to move it. You might try a simple machine that's the basis of much modern machinery --- a pulley. There are six simple machines: an inclined plane , a lever, a screw, a wedge, a wheel and axle, and a pulley. Basically, a pulley changes the direction of an applied force. Thus, for instance, you can pull on the cable of the pulley, and it will pull a weight.
A pulley, which is derived from the Greek word polos, meaning axis, is a wheel with a groove. A rope, belt, or cable runs inside the groove. That mechanism can be used alone or connected with other pulleys in a pulley system. The greater the number of pulleys in the system, the less force it will take to lift an object.
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