Virtual work arises in the application of the principle of least action to the study of forces and movement of a mechanical system. The work of a force acting on a particle as it moves along a displacement will be different for different displacements. Among all of the possible displacements that a particle may follow, called virtual displacements...
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http://en.wikipedia.org/wiki/Virtual_work
(from the article `mechanics`) A special class of problems in mechanics involves systems in equilibrium. The problem is to find the configuration of the system, subject to whatever ...
Found on
http://www.britannica.com/eb/a-z/v/28
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