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how does a pulley make objects easier to move
how does a pulley make work easier
how does a pulley work easier
how does a pulley works
explain how a pulley does work
describe how a pulley works
do more pulleys make it easier
how do pulleys work physics
how do pulleys work simple explanation
how do pulleys create mechanical advantage
how does a pulley make objects easier to move, how does a pulley make work easier, how does a pulley work easier, how does a pulley works, explain how a pulley does work, describe how a pulley works, do more pulleys make it easier, how do pulleys work physics, how do pulleys work simple explanation, how do pulleys create mechanical advantage
