At its core, a classic basic pulley system consists of two fundamental physical parts working together: a grooved wheel (historically called a sheave) and a flexible rope, cable, chain, or belt that runs along the outer perimeter groove of that wheel. The wheel rotates freely on a central axle or pin, which is supported by a stationary or movable mounting frame known as a block or housing. When a pulling force is applied to the rope or belt running across the wheel's groove, the wheel spins smoothly to redirect the force or reduce the effort required to move a connected load, combining rotational mechanics with tension management.
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