Fabri, Honoré
,
Tractatus physicus de motu locali
,
1646
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inſtanti ſequenti moueritur; </
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<
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tur quies illa durat tantùm vno inſtanti. </
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Theorema
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78.
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Quies illa non fit propter aliquam reflexionem, vt aliqui dicunt
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; </
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la prorſus eſt reflexio, vbi nullum eſt reflectens; </
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<
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">atqui nullum eſt refle
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ctens, vt patet, quia nullum eſt corpus impediens motus propagationem; </
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licèt enim medium impediat, non tamen per modum reflectentis pro
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priè; </
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<
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id
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">immo vt dicemus infrà in puncto reflexionis nulla datur quies; ſed
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motus reflexus ſibi vendicat librum ſingularem. </
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Theorema
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79.
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Hinc ſiue præceſſerit motus violentus, ſiue non, corpus graue eodem vel æ
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quali motu deorſum cadit,
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quia nullus amplius remanet impetus violen
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tus in fine motus violenti, per Th.76. igitur ſolus impetus naturalis li
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bero motu deorsùm fertur. </
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Theorema
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80.
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Hinc reiicies aliquos apud Galileum, qui volunt ideo motum naturalem
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accelerari, quia ſenſim deſtruitur impetus violentus antè impreſſus,
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quod pe
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nitus ridiculum eſt; quia lapis deciſus è rupe etiam motu naturaliter
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accelerato deorſum cadit, licèt eò nunquam motu violento euectus
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fuerit. </
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">Obſeruabis hanc hypotheſim gradus impetus violenti æqualis perfe
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ctionis cum innato eſſe falſam. </
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">Primò, quia commodius eſt potentiæ
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motrici producere imperfectiorem impetum, ſic enim plures illius gra
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dus producere poteſt. </
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<
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">Secundò, quia in reflexo ſurſum vltimus gradus
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qui deſtruitur eſt imperfectior innato, eſt enim acquiſitus; igitur in omni
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alio motu ſursùm. </
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">Tertiò, quia violentus eſt cum innato in eadem ſubie
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cti parte; ſed idem ſubiectum formas homogeneas non patitur, de quò
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aliàs, hinc dicendum ſupereſt non quieſcere mobile in fine motus </
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Theorema
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81.
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Corpus quod non grauitat proiicitur ſurſum motu æquabili per ſe
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; </
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nihil eſt quod deſtruat ipſum impetum; </
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<
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">igitur ſemper moueretur, niſi
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per accidens ab ipſo medio eius motus retardaretur; </
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<
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per ſe,
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cum ratione medij retardetur; immò quò leuius eſt, faciliùs à medio re
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tinetur, vide Th.61. </
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Theorema
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82.
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Non creſcit impetus naturalis in motu violento ſurſum
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; probatur primò,
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quia impetus naturalis aduentitius ſupponit motum deorſum, ad cuius
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intenſionem à natura fuit inſtitutus per reſp. </
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<
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ſert.l.2. adde quod tardiùs aſcenderet, quàm deſcenderet; </
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<
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ciùs deſcenderet poſtmotum violentum corpus graue, quàm ſi nullo mo
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tu violento præuio demitteretur deorſum, quæ omnia experimentis </
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