ocr: Pulleys with more than one wheel Pulleys with more than one wheel are called compound pulleys. - DOUBLED - FORCE LIFTING FORCE The extra wheel in this picture doubles the length of the rope used to lift a load. This, in turn, doubles the effect of the lifting force, so that the same amount of effort can be applied to. lift a heavier load. We describe this as magnilying the force used to lift an object. A pulley system can magnify forces even more by running the rope over more wheels.
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