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Read p F72-75 Mechanical Advantage- The number of times a machine multiplies the force applied. Pulley- A rope fits over a grooved wheel, the wheel turns when rope moves over it. Pulley Systems- Several pulleys acting together. They allow a mechanical advantage to occur. Pulleys change the direction of force. A fixed pulley does not multiply the effort force. Pulleys make lifting, positioning, and moving easier. |