OEM

A movable pulley is a pulley in which when you move a large object, the drum moves with it. There is no change in the path of the force you need to use, but the load will “come to feel” lighter than it really is. For example, if you are hauling a large hay bale up the barn’s attic, a moveable pulley will make the load truly feel a whole lot lighter, even although you’re pulling in the very same course.

OEM