“To every action there is always opposed an equal reaction”

— Isaac Newton, book Philosophiae Naturalis Principia Mathematica

Laws of Motion, III
Philosophiae Naturalis Principia Mathematica (1687)
Context: To every action there is always opposed an equal reaction; or, the mutual actions of two bodies upon each other are always equal, and directed to contrary parts.

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Isaac Newton171

British physicist and mathematician and founder of modern c… 1643–1727

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“To every action there is always opposed an equal reaction; or, the mutual actions of two bodies upon each other are always equal, and directed to contrary parts.”

Isaac Newton book Philosophiae Naturalis Principia Mathematica

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Philosophiæ Naturalis Principia Mathematica (1687)

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