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　　It is made up of several fixed pulleys and moving pulleys, which can achieve the purpose of saving effort and changing the direction of force action. During use, the amount of effort saved and the method of winding the rope depends on the effect of the pulley set. The moving pulley is carried by two ropes, that is, each rope bears the force of the object and the moving pulley is one-half of the total weight of the object and the moving pulley.

　　A pulley is a simple machine that can rotate about the central axis composed of a disc with grooves that can rotate about the central axis and a flexible cable (rope, tape, steel cable, chain, etc.) that can cross the disc. 

　　It is made up of several fixed pulleys and moving pulleys, which can achieve the purpose of saving effort and changing the direction of force action. During use, the amount of effort saved and the method of winding the rope depends on the effect of the pulley set. The moving pulley is carried by two ropes, that is, each rope bears the force of the object and the moving pulley is one-half of the total weight of the object and the moving pulley.

　　A pulley is a simple machine that can rotate about the central axis composed of a disc with grooves that can rotate about the central axis and a flexible cable (rope, tape, steel cable, chain, etc.) that can cross the disc.