A movable pulley is a pulley the place when you go a hefty item, the drum moves with it. There is no adjust in the course of the pressure you need to use, but the load will “come to feel” lighter than it truly is. For example, if you happen to be hauling a large hay bale up the barn’s attic, a moveable pulley will make the load really feel a lot lighter, even even though you’re pulling in the identical direction.