Pulleys are simple machines that consist of a wheel with a grooved rim, used to transmit power or change the direction of force. They are often used in combination with ropes or cables to lift heavy objects or apply force to move objects. By distributing the force over multiple ropes or cables, pulleys can reduce the amount of force needed to perform a task, making them useful in a variety of applications such as lifting systems, cranes, and hoists.
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