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# Law-of-action-and-reaction

noun, Physics.
1.
See under .
noun, Physics.
1.
any of three laws of classical mechanics, either the law that a body remains at rest or in motion with a constant velocity unless an external force acts on the body (first law of motion) the law that the sum of the forces acting on a body is equal to the product of the mass of the body and the acceleration produced by the forces, with motion in the direction of the resultant of the forces (second law of motion) or the law that for every force acting on a body, the body exerts a force having equal magnitude and the opposite direction along the same line of action as the original force (third law of motion or law of action and reaction)

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• Law-of-areas

noun, Astronomy. 1. See under . noun, Astronomy. 1. any one of three laws governing planetary motion: each planet revolves in an ellipse, with the sun at one focus; the line connecting a planet to the sun sweeps out equal areas in equal periods of time (law of areas) or the square of the period […]

• Law-of-averages

noun 1. a statistical principle formulated by Jakob Bernoulli to show a more or less predictable ratio between the number of random trials of an event and its occurrences. 2. Informal. the principle that, in the long run, probability as naively conceived will operate and influence any one occurrence. noun 1. (popularly) the expectation that […]

• Law of conservation

law of conservation For the laws of conservation, see under conservation law.

• Law-of-conservation-of-charge

noun, Physics. 1. . noun, Physics. 1. the principle that the total electric charge of a system is constant. noun 1. the principle that the total charge of any isolated system is constant and independent of changes that take place within the system conservation of charge A conservation law stating that the total electric charge […]

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