ocr: PRINCIPLES OF SCIENCE PULLEYS PULLEY IS SIMPLY A WHEEL, BLOCK - - with a rope running over it, AND hung by its axle. A single pulley TACKLE can help: you lift a load simply - by changing the direction ofyour effort. Joining several pulleys together to make a compoundpulley, or block and. tackle, gives you a mechanical PULLEY advantage, making beavy objects easy to lift. LOAD. Single and Compound Pulleys Related EFFORT Machines
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