Pulley

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A pulley, also known as a sheave, is a wheel with a groove around its circumference that is used to change the direction of force in a mechanical system. It achieves this by allowing ropes or cables to pass through its groove, effectively altering their pull or lift direction. This simple yet effective device has been utilized for centuries and continues to play an important role in various applications, such as lifting heavy loads, hoisting materials, and operating machinery.