d'Alembert's principle

d'A·lem·bert's principle | \¦daləm¦be(ə)rz-\

Definition of d'Alembert's principle 

: a principle in mechanics: the reaction due to the inertia of an accelerated body (as a baseball) is equal and opposite to the force causing the acceleration (as the blow of a bat upon the baseball) and results in a condition of kinetic equilibrium — compare law of motion sense 3

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History and Etymology for d'Alembert's principle

after Jean LeRond d'Alembert †1783 French mathematician, its formulator

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a state of commotion or excitement

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