A movable pulley is a pulley the place when you shift a heavy object, the drum moves with it. There is no alter in the path of the pressure you need to apply, but the load will “come to feel” lighter than it really is. For example, if you happen to be hauling a weighty hay bale up the barn’s attic, a moveable pulley will make the load come to feel a good deal lighter, even though you happen to be pulling in the identical path.