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action and reaction

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action and reaction

In physical mechanics, equal and opposite forces which act together. For example, the pressure of expanding gases from the burning of fuel in a rocket engine produces an equal and opposite reaction, which causes the rocket to move. This is Newton's third law of motion (see Newton's laws of motion.



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? Mentioned in ? References in classic literature
 
The absolute balance of Give and Take, the doctrine that every thing has its price,--and if that price is not paid, not that thing but something else is obtained, and that it is impossible to get any thing without its price,--is not less sublime in the columns of a leger than in the budgets of states, in the laws of light and darkness, in all the action and reaction of nature.
And thus the mind preyed upon the body, and disordered the system of the nerves, and they in turn increased the troubles of the mind, till by action and reaction his health was seriously impaired; and not one of us could convince him that the aspect of our affairs was not half so gloomy, so utterly hopeless, as his morbid imagination represented it to be.
Had the unknown builder who erected and owned these new villas contented himself by simply building each within its own grounds, it is probable that these three small groups of people would have remained hardly conscious of each other's existence, and that there would have been no opportunity for that action and reaction which is here set forth.
 
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