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Tangle-web spiders are amazing weight-lifting engineers. They can snag prey 50 times heavier than themselves, like lizards and small mammals, using pulleys of stretchy silk. Spiders weave their own ...

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 ...

A pulley is a simple machine using a wheel and a cord that's designed for lifting. A pulley is a simple machine using a wheel and a cord that's designed for lifting. Pulleys help make work easier by ...