A pulley, also called pulley , carrucha , trochlear , sheaves or cheek, is a simple machine for transmitting a force. It is a wheel generally solid and grooved edge, which, in the course a rope or cable that passes through the channel ("throat"), is used as the transmission element to change the direction of motion in machines and mechanisms. In addition, joint-forming equipment or hoists - serves to reduce the magnitude of the force required to move a weight.
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