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I think what you want is the "mechanical advantage". It's 2 .
To calculate the mechanical advantage of a movable pulley system, you divide the load force by the effort force. The formula is MA = Load Force / Effort Force. The mechanical advantage of a movable pulley is always 2 because the effort force is half the load force when using a system with a movable pulley.
A fixed pulley does not provide a mechanical advantage because it only changes the direction of the force applied, not the amount of force required.
I do believe it is equal to the number of ropes you have.
The three types of pulleys are fixed pulleys, movable (or movable) pulleys, and compound pulleys. Fixed pulleys change the direction of the force applied, movable pulleys provide a mechanical advantage by reducing the force needed, and compound pulleys combine fixed and movable pulleys for increased mechanical advantage.
The kind of pulley has an ideal machanical advantage of 2 is called "Movable Pulley". From, Bryan Hollick
A fixed pulley system has a mechanical advantage of 1 since it changes the direction of the force but not its magnitude. A movable pulley system doubles the mechanical advantage by reducing the force required by half. A compound pulley system combines fixed and movable pulleys to further increase the mechanical advantage based on the number of pulleys used.
Movable pully
The mechanical advantage of a movable pulley is determined by counting the number of supporting ropes that thread through the pulley. A movable pulley with a single supporting rope will have a mechanical advantage of 2, as it reduces the effort needed by half. If there are multiple supporting ropes, the mechanical advantage will be equal to the number of supporting ropes.
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