Every body perseveres in its state of rest, or of uniform motion in a right line, unless… — Isaac Newton
Every body perseveres in its state of rest, or of uniform motion in a right line, unless it is compelled to change that state by forces impressed thereon.
In the original Latin
Corpus omne perseverare in statu suo quiescendi vel movendi uniformiter in directum, nisi quatenus a viribus impressis cogitur statum illum mutare.
Principia · 1687
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Current citation
Newton, Isaac. "Axioms, or the Laws of Motion." The Principia, translated by Andrew Motte. Prometheus, 1995, law 1.
Original citation
Newton, Isaac. "Axiomata sive Leges Motus: [Axioms, or Laws of Motion]." Philosophiae Naturalis Principia Mathematica [The Mathematical Principles of Natural Philosophy], vol. 1. London: Josephi Streater, 1687, law 1.