Definitions for vis viva
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In the history of science, vis viva is an obsolete scientific theory that served as an elementary and limited early formulation of the principle of conservation of energy. It was the first [known] description of what we now call kinetic energy or of energy related to sensible motions. Proposed by Gottfried Leibniz over the period 1676–1689, the theory was controversial as it seemed to oppose the theory of conservation of momentum advocated by Sir Isaac Newton and René Descartes. The two theories are now understood to be complementary. The theory was eventually absorbed into the modern theory of energy though the term still survives in the context of celestial mechanics through the vis viva equation.
The Standard Electrical Dictionary
The kinetic energy of a body in motion; "mechanical energy."
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