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 Pulley What is it? A pulley is a wheel with a groove around the edge. Pulleys can be used as a simple machine to change the direction of a pulling force. By throwing a rope or chain over a pulley, you can lift something up by pulling down. Give me an example! If you hook several pulleys up in series, you can create a mechanical advantage and lift several times the weight with less effort. This is called a block and tackle, and is often used to lift pianos and other heavy objects. Copyright ©2010, PCS Edventures, Inc. All Rights Reserved. |