Newton, Isaac
,
Philosophia naturalis principia mathematica
,
1713
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mutat ſtatum ſuum; & reliquorum, quibuſcum actio illa non in
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tercedit, commune gravitatis centrum nihil inde patitur; diſtantia
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autem horum duorum centrorum dividitur a communi corporum
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omnium centro in partes ſummis totalibus corporum quorum
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ſunt centra reciproce proportionales; adeoque centris illis duobus
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ſtatum ſuum movendi vel quieſcendi ſervantibus, commune omNI
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um centrum ſervat etiam ſtatum ſuum: manifeſtum eſt quod com
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mune illud omnium centrum ob actiones binorum corporum inter
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ſe nunquam mutat ſtatum ſuum quoad motum & quietem. </
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<
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>In tali
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autem ſyſtemate actiones omnes corporum inter ſe, vel inter bina
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ſunt corpora, vel ab actionibus inter bina compoſitæ; & propterea
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communi omnium centro mutationem in ſtatu motus ejus vel quie
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tis nunquam inducunt. </
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<
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>Quare cum centrum illud ubi corpora non
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agunt in ſe invicem, vel quieſcit, vel in recta aliqua progreditur uNI
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formiter; perget idem, non obſtantibus corporum actionibus inter
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ſe, vel ſemper quieſcere, vel ſemper progredi uniformiter in dire
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ctum; niſi a viribus in ſyſtema extrinſecus impreſſis deturbetur de hoc
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ſtatu. </
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<
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>Eſt igitur ſyſtematis corporum plurium Lex eadem quæ cor
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poris ſolitarii, quoad perſeverantiam in ſtatu motus vel quietis. </
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<
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tus enim progreſſivus ſeu corporis ſolitarii ſeu ſyſtematis corporum
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ex motu centri gravitatis æſtimari ſemper debet. </
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IATA,
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VF.</
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COROLLARIUM V.
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Corporum dato ſpatio incluſorum iidem ſunt motus inter ſe, ſive ſpa
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tium illud quieſcat, ſive moveatur idem uniformiter in directum
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abſque motu circulari.
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<
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>Nam differentiæ motuum tendentium ad eandem partem, & ſum
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mæ tendentium ad contrarias, eædem ſunt ſub initio in
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caſu (ex
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hypotheſi) & ex his ſummis vel differentiis oriuntur congreſſus & im
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petus quibus corpora ſe mutuo feriunt. </
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<
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>Ergo per Legem 11 æquales e
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runt congreſſuum effectus in
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caſu; & propterea manebunt mo
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tus inter ſe in uno caſu æquales motibus inter ſe in altero. </
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<
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>Idem com
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probatur experimento luculento. </
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<
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>Motus omnes eodem modo ſe ha
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bent in Navi, ſive ea quieſcat, ſive moveatur uniformiter in directum. </
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COROLLARIUM VI.
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Si corpora
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inter ſe, & a viribus acceler atrici
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bus æqualibus ſecundum lineas parallelas urgeantur; pergent omnia
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eodem modo moveri inter ſe, ac ſi viribus illis non eſſent incitata.
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<
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>Nam vires illæ æqualiter (pro quantitatibus movendorum corpo-</
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