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Quotes from Philosophiae Naturalis Principia Mathematica — Isaac Newton

1643–1727 England

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2 quotes

Every body continues in its state of rest, or of uniform motion in a right line, unless it is compelled to change that state by forces impressed upon it.

Philosophiae Naturalis Principia Mathematica (1687)

The alternation of motion is ever proportional to the motive force impressed; and is made in the direction of the right line in which that force is impressed.

Philosophiae Naturalis Principia Mathematica (1687)

Attribution

Quotes and notes from Wikiquote: Isaac Newton (page history), available under CC BY-SA 4.0.