4.11 Machines


A machine allows the application of a small force over a large distance to be utilized to effect a large force over a small distance. The amount of work done by a machine, however, is never more than what was put into it. Duration: 8:38.

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Machines and Energy

Paul shows how a simple lever lifts a load, and how Nellie Newton lifts loads with pulley systems. Duration: 8:26

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