Pulley system. Loaded movable pulleys. Mechanical Power. Carrying the weights with pulleys use human power. The laws of motion. Load versus effort. Science experiments on force and motion with pulley.

Pulley system. Loaded movable pulleys. Mechanical Power. Carrying the weights with pulleys use human power. The laws of motion. Load versus effort. Science experiments on force and motion with pulley.图片
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会员专享Pulley system. Loaded movable pulleys. Mechanical Power. Carrying the weights with pulleys use human power. The laws of motion. Load versus effort. Science experiments on force and motion with pulley.
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