Pulleys are categorized into four primary mechanical configurations based on their mounting and operational characteristics. First is the fixed pulley, where the axle is mounted in a stationary place to change the direction of force. Second is the movable pulley, where the axle is attached to the load, moving along the rope to provide mechanical advantage and reduce required lifting force. Third is the compound pulley system, which combines fixed and movable pulleys to multiply lifting power significantly. Fourth is the block and tackle, an advanced arrangement of multiple pulleys and ropes used extensively in sailing and heavy industrial rigging.
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