"Lex I. Corpus omne perseverare in statu suo quiescendi vel movendi uniformiter in directum, nisi quatenus a viribus impressi cogitur statum illum mutare. Lex II. Mutationem motus proportionalem esse vi motrici impressa; & fieri secundum lineam rectam qua vis illa imprimatur. Lex III. Actioni contrariam semper & aequalem esse reactionem: sive corporum duorum actiones in se mutuo semper esse aequales & in partes contrarias dirigi. (English translation: Law I. Every body perseveres in its state of rest or of uniform motion in a straight line, except in so far as it is compelled to change that state by the forces impressed upon it. Law II. The change of motion is proportional to the motive force impressed upon it; and takes place along the straight line on which that force is impressed. Law III. To an action there is always an opposite and equal reaction: or the actions of two bodies on each other are always equal and directed in opposite directions.)"