Base on the fact below, it is therefore not true that movable pulleys reduce the input force.
Fixed pulley is positioned in a specific position which cannot be changed through out its application except it is uninstalled and installed in another fixed position. The magnitude of the force applied at one end will be the same at the other side. And it changes the direction of the output force.
Fixed and movable pulleys: One, two or more movable pulleys can be attached to a fixed pulley in order to increase efficiency or to achieve a certain goal.
Movable pulleys are the opposite of fixed pulleys. Movable pulley, as its name implies, can move from one position to another but it does not change the direction of the force applied. The force applied at one side of the pulley multiplies at the other side for the lifting of the load.
Base on the fact above, it is therefore not true that movable pulleys reduce the input force.
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