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　　The fixed pulley can change the direction of force, but it cannot pull the animal body very effortlessly. The moving pulley cannot change the direction of force, but it can easily pull the animal body. The pulley set combines a fixed pulley and a moving pulley, which can not only change the direction of force, but also save effort to pull the animal body. If the extra work done during use of the pulley set is ignored, the more dynamic pulleys are used, the more effort it saves.

　　When using pulley sets, it is easy to see that although using pulley sets saves effort, it takes a distance - the distance of power moving is greater than the distance of the goods rising.

　　The fixed pulley can change the direction of force, but it cannot pull the animal body very effortlessly. The moving pulley cannot change the direction of force, but it can easily pull the animal body. The pulley set combines a fixed pulley and a moving pulley, which can not only change the direction of force, but also save effort to pull the animal body. If the extra work done during use of the pulley set is ignored, the more dynamic pulleys are used, the more effort it saves.

　　When using pulley sets, it is easy to see that although using pulley sets saves effort, it takes a distance - the distance of power moving is greater than the distance of the goods rising.