SImple Machines: Pulleys (1954)
Explains how pulleys work to lift heavy weights more easily. A fixed pulley changes the direction of force, allowing for easier lifting, while a movable pulley reduces the amount of force needed to lift a weight. By using multiple pulleys in a system known as a block and tackle, the force required to lift a weight can be significantly decreased, although this requires moving the force over a greater distance. The video illustrates how different pulley setups can help in lifting heavy loads more efficiently.
Keywords
pulleys, fixed pulley, movable pulley, block and tackle, force, lifting, simple machines, weight, mechanics
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