Fabri, Honoré
,
Tractatus physicus de motu locali
,
1646
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accelerato, tùm deinde propter impetus acquiſiti vim, à centro versùs
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oppoſitum circumferentiæ punctum iret, motu certè violento, qui ta
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men ab extrinſeco non eſſet. </
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Hypotheſis
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1.
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Corpus graue projectum ſurſum tandem redit
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; Hæc hypotheſis certa eſt,
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& nemo eſt qui eam in dubium vocet. </
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Axioma
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1.
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Quidquid erat, & deſinit eſſe deſtruitur
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; Hoc Axioma certum eſt, quip
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pe deſtrui hoc tantùm dicitur, quod deſinit eſſe. </
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Axioma
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2.
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Quidquid destruitur, ad exigentiam alicuius destruitur, ſaltem totius na
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turæ.
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<
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"> Hoc Axioma idem eſt cum Axiom. 14. l. 1. n. </
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">2. vnde alia expli
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catione minimè indiget; hoc ipſum etiam demonſtraui in Th.147.149.
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150,&c. </
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<
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Theorema
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1.
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Datur motus violentus
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; demonſtro; corpus proiicitur per lineam ver
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ticalem per hyp. </
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<
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">1. ſed hic motus eſt à principio extrinſeco, igitur eſt
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violentus per def.1. probatur minor; Primò, quia illud eſt principium,
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ſeu cauſa motus, ex cuius applicatione ſemper ſequitur motus per Ax.11.
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l. 1.n. </
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<
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">1. ſed ex applicatione potentiæ extrinſecæ v. g. arcus, manus, &c. </
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ad lineam ſurſum ſemper ſequitur motus ſurſum; igitur eſt illius cauſa. </
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Secundò probatur, quia mobile projectum ſursùm mouetur adhuc ſepa
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ratum à potentia motrice per hyp. </
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">6.l.1. igitur potentia motrix impreſ
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ſit aliquid mobili, vi cuius deinde mouetur, igitur hic motus eſt à prin
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cipio extrinſeco. </
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">Diceret fortè aliquis produci hunc motum ab ipſo mobili; ſed con
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trà; </
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<
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">igitur ſemper produceret, quod abſurdum eſt: </
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<
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">dicet, ad hoc vt pro
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ducat determinari debere ab aliquo, ſed contrà; </
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<
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">illud à quo determina
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tur vel eſt extrinſecum, vel intrinſecum, ſi primum, ergo hic motus eſt
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ſemper à principio extrinſeco, quod ſatis eſt eſſe determinans per def.1.
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ſi verò eſt intrinſecum; igitur ſemper eſſet hic motus, quamdiu eſſet
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ipſum mobile, quod eſt contra hyp. </
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<
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">1. nam reuera non ſemper mo
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uetur. </
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">Diceret fortè alius excitari quædam corpuſcula, à quibus mouetur
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corpus graue ſursùm; ſed contrà; </
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<
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">nam vel ſunt in ipſo mobili illa cor
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puſcula, vel extra mobile; ſi primum; </
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">igitur hic motus ſemper erit ab
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extrinſeco mediatè, cum ab extrinſeco excitentur; </
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hoc; vt motus dicatur violentus per def. </
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<
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">1. ſi verò ſunt extra mobile;
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igitur motus ille eſt ſemper ab extrinſeco, idque duplici nomine. </
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<
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">Denique diceret alius ex ſuppoſitione, quod terra moueatur non poſ
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ſe corpus graue proiici ſursùm per lineam verticalem, niſi tantùm ad
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ſpeciem; </
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nò, quoad eius fieri poſſit; videbitur enim iis, qui vehuntur eadem naui </
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