Fabri, Honoré
,
Tractatus physicus de motu locali
,
1646
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qui reuera habet effectum formalem ſecundarium ad intra, ſcilicet rare
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factionem, quæ eſt mutatio extenſionis; </
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<
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">quemadmodum motus eſt mu
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tatio loci, vel vbicationis; </
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<
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">igitur cum hoc | non obſtante, calor pro
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ducat calorem ad extra; cur impetus non producit impetum? </
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<
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">cuius pro
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ductionem concedis virtuti corporum reſiſtitiuæ, id eſt vnioni, impe
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netrabilitati, & cæteris huiuſmodi modorum ſuperfluorum quiſquiliis;
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de quibus plurimi tecum contendunt. </
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Scholium.
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<
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">Obſeruabis nonnullas eſſe difficultates, quæ communes ſunt etiam
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illi ſententiæ, quam ſequuntur ij, qui exiſtimant impetum ad extra
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produci à corpore impacto; quas tamen facilè ſoluemus infrà in conti
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nuata noſtrorum Theorematum ſerie. </
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Theorema
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41.
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Aliquis impetus non producitur ab alio impetu.
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<
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"> Probatur, quia aliquis
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impetus producitur ad intra à potentia motrice, vt patet. </
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<
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">2. cum non
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detur progreſſus in infinitum, nec impetus idem producatur à ſe ipſo, ad
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aliquem tandem vltimum ſeu primum deueniendum eſt, qui ab alio im
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petu non producatur. </
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Theorema
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42.
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Impetus producitur ſemper ad extra ab alio impetu.
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<
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"> Quia cum ſemper
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ad illius productionem requiratur applicatio alterius impetus; certè
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non eſt ponenda alia cauſa per Ax. 11. </
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Theorema
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43.
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Hinc impetus habet duplex munus cauſæ; </
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& efficientis ad extra
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; vtrumque patet ex dictis. </
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Theorema
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44.
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Impetus agit tantùm ad extra, vt tollat impedimentum motus
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; </
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<
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">cum enim
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motus ſit finis intrinſecus impetus; </
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<
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id
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">certè ſi nihil impediret motum,
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haud dubiè gauderet impetus ſuo fine; </
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<
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">igitur fruſtrà quidquam aliud
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deſideraret; </
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<
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">præterea licèt applicetur à tergo aliud mobile; </
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<
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">non tamen
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propterea in eo producit, vt conſtat experientiâ; </
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<
s
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">denique cum tan
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tùm impetum cognoſcamus per motum; </
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<
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">cum nequidem eſſet impetus,
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ſi non eſſet motus, per Th. 17. certè totus eſt impetus propter motum
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qui eſt eius finis; </
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<
s
id
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">igitur non agit niſi propter motum: </
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<
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">ſed non poteſt
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excogitari, quid faciat propter motum, dum agit, niſi dicamus ideo
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tantùm agere, vt tollatur impedimentum; cum certum ſit corpus im
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mobile, in quod impingitur aliud mobile, impedire eius motum. </
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Theorema
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45.
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Hinc non ſimul agit impetus in orbem ſed tantùm per lineam
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ſui motus; </
s
>
<
s
id
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">cui ſi nullum corpus occurrit reuerà non agit,
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Ratio eſt; </
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<
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cèt aliud corpus mobili admoueatur in alia linea; </
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>
<
s
id
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">cum non impediat
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eius motum, vt ſuppono; </
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<
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id
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">cum agat tantùm impetus ad extra, vt tollat, </
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