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This web page location: LightHistory of Light Theoriesmathematical terms, mechanical advantage, physics, pull, distanceDeeper web pages: Machines help people do work by changing the amount of force and the distance needed to move objects. Work, in physics, is the amount of force used to move an object multiplied by the distance over which the force is applied. This can be written in mathematical terms: Work = Force X Distance Force is defined as a push or a pull exerted on one body by another, such as a hand pushing a book across a table. Distance refers to the distance a load is moved by the force. The advantage that a machine gives its user by affecting the amount of force needed is called the machine’s mechanical advantage, or MA. Knowing the mechanical advantage of a machine allows a user to predict how much force is needed to lift a given object. Article key phrases: 

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