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Which is more labor-saving, fixed pulley or movable pulley and why?

1 Answers

DominicRose

07/29/25 3:59pm

Using a movable pulley can save half the force (provided the gravity of the movable pulley can be ignored), while using a fixed pulley definitely does not save force. When the gravity of the movable pulley is less than the gravity of the object: When the gravity of the movable pulley is less than the gravity of the object, using the movable pulley saves force. If the gravity of the movable pulley is greater than that of the object, it certainly does not save force. People would not use a very heavy movable pulley to lift a feather. When using a movable pulley: When using a movable pulley, lifting the object also requires lifting the movable pulley. If the movable pulley is heavy, the additional work done is relatively more. When using a fixed pulley to lift an object, the fixed pulley does not move with the object, so no additional work is done on the fixed pulley (only additional work is done to overcome friction). Therefore, generally speaking, using a fixed pulley has higher mechanical efficiency.

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