Fabri, Honoré
,
Tractatus physicus de motu locali
,
1646
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Theorema
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93.
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Impetus propagatur eodem inſtanti, id eſt, ſine temporis ſucceſſione.
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<
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"> Proba
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tur; </
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<
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BCDE; </
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<
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id
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">quia ſi primo inſtanti produceretur in A, & ſecundo in B, vel
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A moueretur ante B, vel impetus in A eſſet fruſtrà; </
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<
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dum; nam totum AE, ſimul mouetur. </
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Theorema
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94.
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Tribus tantùm modis propagari poteſt impetus ratione intenſionis.
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<
s
id
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N14608
"> Primò
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ſi æqualiter omnibus partibus ſubjecti diſtribuatur; id eſt vniformiter. </
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Secundò, ſi plùs partibus propioribus, & minùs remotioribus. </
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<
s
id
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">Tertiò, è
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contra, ſi plùs remotioribus, & minùs propioribus; </
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<
s
id
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N14618
">tribus etiam ratione
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perfectionis eo modo, quo diximus de intenſione; </
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<
s
id
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">at verò nouem mo
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dis propagari poteſt ratione vtriuſque; patet ex regula combinationum; </
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ſi enim 3. ducantur in 3. habebis 9. Iam ſupereſt, vt videamus, an reue
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rà omnibus iſtis modis impetus re ipſa propagetur; </
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<
s
id
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">quod licèt difficile
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ſit, & vix hactenus explicatum: Audeo tamen polliceri meum ſuper hac
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re conatum non prorſus inutilem fore. </
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<
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Theorema
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95.
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</
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Impetus propagatur vniformiter in mobili, cuius omnes partes mouentur
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æquali motu
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; </
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<
s
id
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">probatur, quia impetus non cognoſcitur niſi per motum;
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igitur vbi eſt æqualis motus, debet eſſe æqualis impetus in omnibus par
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tibus, id eſt æqualis graduum heterogeneorum collectio, in quo non
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eſt difficultas. </
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Scholium.
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<
s
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">Obſeruabis illud mobile moueri motu æquali ſecundum omnes ſui
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partes, quod mouetur motu recto; quippe fieri non poteſt, quin omnes
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partes, quæ mouentur motu recto ſimplici, motu etiam æquali mouean
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tur. </
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Theorema
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96.
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Cum duo corpora ſeſe mutuò tangunt, impetus in vtroque propagatur
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ſint
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v. g. globi A & B, æquales ſibi inuicem contigui in C, ſit applicata po
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tentia in D, non modò producet impetum in globo A, ſed etiam in B: </
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<
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probatur primò, quia ſe habent per modum vnius, vt patet ex reſiſten
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tia, nec enim A moueri poteſt ſine B per lineam DE, quod certè cla
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riſſimum eſt; probatur ſecundò quia ſi A produceret impetum in B, duo
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globi, vel 3. vel 5. vel infiniti tantùm reſiſterent, quantùm vnicus glo
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bus, quod falſum & abſurdum eſt. </
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<
s
id
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<
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producitur, & propagatur impetus in toto A; </
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<
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id
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">quia vna pars non poteſt
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moueri ſine alia per Th. 33. ſed non poteſt A moueri niſi moueatur B;
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igitur in vtroque ſimul, & æqualiter propagatur impetus. </
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Corollarium
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1.
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<
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