Wheels {pulley}| on axes can have rope with which to lift loads by pulling down.
Two pulley sets {block and tackle}| can pass rope back and forth over wheels {block} {tackle, pulley}. Rope pulled long distance supplies force to raise load short distance.
Pulley middle wheels {idler wheel}| allow drive wheel and driven wheel to turn in same direction.
7-Machine-Kinds-Mechanical-Rotation
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Date Modified: 2022.0225