Fabri, Honoré
,
Tractatus physicus de motu locali
,
1646
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quo infrà, per Ax.14.num.2. certè tamdiu non deſtruitur, quamdiu nihil
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eſt, quod exigat eius deſtructionem; igitur tamdiu conſeruatur per Ax.
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14.num.3. </
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Corollarium
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1.
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<
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">Inde certa ducitur ratio, cur mobile etiam ſeparatum à manu mouea
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tur; </
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<
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">quia ſcilicet ipſi adhuc ineſt impetus, qui eſt cauſa motus; </
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<
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ſuppoſui iam antè de hac hypotheſi quod ſit, non tamen propter quid ſit;
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igitur hæc eſt germana illius ratio & cauſa. </
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Corollarium.
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2.
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<
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">Hinc etiam rationem ducemus æquè præclaram in lib.2. motus natu
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raliter accelerati. </
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Theorema
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148.
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Impetus productus aliquando deſtruitur
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; Probatur, quia mobile, quod
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antè mouebatur, deſinit tandem moueri per hyp. </
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<
s
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">4. igitur deſtruitur
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impetus; alioqui ſi remaneret, eſſet cauſa neceſſaria ſine effectu contra
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Ax.12. ideo porrò deſtruitur, quia aliquid exigit eius deſtructionem,
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quippe hæc eſt vnica deſtructionis ratio per Ax.14. num.2. </
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Theorema
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149.
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In lineis oppoſitis impetus deſtruitur ab impetu ſuo modo
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; </
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<
s
id
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">ſit enim globus
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proiectus verſus auſtrum; </
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<
s
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">cui deinde imprimatur nouus impetus ver
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ſus Boream; </
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<
s
id
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">deſtruitur prior vt conſtat, igitur ad exigentiam alicuius,
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ſed nihil eſt quod poſſit exigere, niſi nouus impetus, ſcilicet mediatè;
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nihil enim aliud eſt applicatum, igitur nihil aliud exigit per Ax. 10.
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hæc porrò exigentia non eſt immediata, ſed mediata, vt dixi. </
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Theorema
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150.
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Impetus naturalis innatus exigit deſtructionem alterius, qui ab extrinſeco
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ad diuerſam lineam corpori graui impreſſus eſt ſcilicet mediatè,
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experientia
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certa eſt in proiectis, quæ tandem quieſcunt; </
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<
s
id
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">igitur ad exigentiam ali
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cuius, ſed illud tantùm eſt impetus innatus; </
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<
s
id
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">nec enim eſt ſubſtantia
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corporis; </
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<
s
id
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">tùm quia qualitas ſubſtantiæ non opponitur; </
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<
s
id
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">tùm quia nulla
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eſſet ratio, cur ſubſtantia deſtrueret potiùs vno inſtanti vnum gradum,
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quàm duos, quàm tres; </
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>
<
s
id
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">adde quod ex duobus violentis oppoſitis alte
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rum deſtruit; igitur impetus eſt cauſa ſufficiens deſtructiua impetus,
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igitur non eſt ponenda alia, eo ſcilicet modo, quo diximus. </
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Theorema
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151.
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In reflexione deſtruitur aliquid impotus ſaltem per accidens
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; patet expe
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rientia, ſiue propter nouam determinationem, ſiue propter attritum,
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vel preſſionem partium, de quo infrà. </
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Theorema
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152.
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Hinc ſi excipias tantùm impetum naturalem innatum, qui per ſuam de
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terminationem neceſſariam, & quam nunquam mutat, pugnat cum omni
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