Newton, Isaac
,
Philosophia naturalis principia mathematica
,
1713
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quum illud datam poſitionem ſervet necne; quies vera ex horum
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ſitu inter ſe definiri nequit. </
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<
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>Motus proprietas eſt, quod partes, quæ datas ſervant poſitiones
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ad tota, participant motus eorundem totorum. </
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<
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>Nam Gyrantium
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partes omnes conantur recedere ab axe motus, & Progredientium
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impetus oritur ex conjuncto impetu partium ſingularum. </
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<
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>Motis
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igitur corporibus ambientibus, moventur quæ in ambientibus rela
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tive quieſcunt. </
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<
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>Et propterea motus verus & abſolutus definiri ne
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quit per tranſlationem e vicinia corporum, quæ tanquam quieſcen
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tia ſpectantur. </
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<
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>Debent enim corpora externa non ſolum tanquam qui
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eſcentia ſpectari, ſed etiam vere quieſcere. </
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<
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>Alioquin incluſa om
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nia, præter tranſlationem e vicinia ambientium, participabunt
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etiam ambientium motus veros; & ſublata illa tranſlatione non
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vere quieſcent, ſed tanquam quieſcentia ſolummodo ſpectabun
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tur. </
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<
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>Sunt enim ambientia ad incluſa, ut totius pars exterior ad
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partem interiorem, vel ut cortex ad nucleum. </
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<
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>Moto autem cor
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tice, nucleus etiam,
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tranſlatione de vicinia corticis, ceu pars
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totius movetur. </
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<
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>Præcedenti proprietati affinis eſt, quod moto Loco movetur una
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Locatum: adeoque corpus, quod de loco moto movetur, participat
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etiam loci ſui motum. </
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<
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>Motus igitur omnes, qui de locis motis
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fiunt, ſunt partes ſolummodo motuum integrorum & abſolutorum:
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& motus omnis integer componitur ex motu corporis de loco ſuo
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primo, & motu loci hujus de loco ſuo, & ſic deinceps; uſQ.E.D.m
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perveniatur ad locum immotum, ut in exemplo Nautæ ſupra me
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morato. </
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<
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>Unde motus integri & abſoluti non niſi per loca immota
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definiri poſſunt: & propterea hos ad loca immota, relativos ad mo
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bilia ſupra retuli. </
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<
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>Loca autem immota non ſunt, niſi quæ omnia
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ab infinito in infinitum datas ſervant poſitiones ad invicem; atque
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adeo ſemper manent immota, ſpatiumque conſtituunt quod Immo
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bile appello. </
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<
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>Cauſæ, quibus motus veri & relativi diſtinguuntur ab invicem,
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ſunt Vires in corpora impreſſæ ad motum generandum. </
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<
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>Motus
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verus nec generatur nec mutatur, niſi per vires in ipſum corpus mo
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tum impreſſas: at motus relativus generari & mutari poteſt
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viribus impreſſis in hoc corpus. </
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<
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>Sufficit enim ut imprimantur in
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alia ſolum corpora ad quæ fit relatio, ut iis cedentibus mutetur
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relatio illa in qua hujus quies vel motus relativus conſiſtit. </
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<
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>Rur
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ſum motus verus a viribus in corpus motum impreſſis ſemper muta
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tur; at motus relativus ab his viribus non mutatur neceſſario. </
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<
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>Nam
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ſi eædem vires in alia etiam corpora, ad quæ ſit relatio, ſic impri-</
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