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Movable Pulley: A pulley that rotates and interprets in accordance to the motion of the pulley or belt. This is typically utilized in blocking and tackle systems, which I will describe later.
Energetic Pulley: The “input” pulley in a twin-pulley system. The shaft of this pulley is pushed by anything like a motor, a crank, or probably another pulley in more substantial techniques. This pulley controls the motion of the belt.

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