In simple, everyday terms, a pulley is a helper machine made of a round wheel with a groove around its edge and a rope or string running through it. Imagine trying to lift a heavy bucket of water straight up out of a deep well—it requires a lot of hard upward pulling against gravity. But if you hang a pulley wheel above the well, drop the rope over the wheel, and pull downward instead, lifting the bucket suddenly feels much easier because your body weight helps you pull down. This simple device changes the direction of your pull, making daily lifting tasks far more manageable.
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