Newton, Isaac, Philosophia naturalis principia mathematica, 1713

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1
TA,
AXIOMATA,
SIVE
LEGES MOTUS.
LEX I.
Corpus omne perſeverare in ſtatu ſuo quieſcendi vel movendi uNI­
formiter in directum, niſi quatenus a viribus impreſſis cogitur
ſtatum illum mutare.
PRojectilia perſeverant in motibus ſuis, niſi quatenus a reſi­
ſtentia aeris retardantur, & vi gravitatis impelluntur deorſum.

Trochus, cujus partes cohærendo perpetuo retrahunt ſeſe a mo­
tibus rectilineis, non ceſſat rotari, niſi quatenus ab aere retardatur.

Majora autem Planetarum & Cometarum corpora motus ſuos &
progreſſivos & circulares in ſpatiis minus reſiſtentibus factos con­
ſervant diutius.
LEX II.
Mutationem motus proportionalem eſſe vi motrici impreſſæ, & fieri
ſecundum lineam rectam qua vis illa imprimitur.
Si vis aliqua motum quemvis generet; dupla duplum, tripla tri­
plum generabit, ſive ſimul & ſemel, ſive gradatim & ſucceſſive im­
preſſa fuerit.
Et hic motus (quoniam in eandem ſemper plagam
cum vi generatrice determinatur) ſi corpus antea movebatur, mo­
tui ejus vel conſpiranti additur, vel contrario ſubducitur, vel obli­
quo oblique adjicitur, & cum eo ſecundum utriuſQ.E.D.termina­
tionem componitur.

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