Fabri, Honoré
,
Tractatus physicus de motu locali
,
1646
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<
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347
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ratio ex eo petitur primò, quòd prius globus demittatur per planum
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inclinatum, ſiue cadat ex ipſa manu, ſiue ex alio plano v.g. ex recto vel
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alio plano decliui. </
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<
s
id
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">Secundò ex eo, quòd priùs moueatur altera extremi
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tas putà C, quàm D; </
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<
s
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">igitur acquirit C plùs impetus motu naturaliter ac
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celerato; </
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<
s
id
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N25897
">igitur retinetur à puncto; </
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<
s
id
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N2589B
">quòd licèt deinde moueatur, tardiùs
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tamen mouetur; </
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<
s
id
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N258A1
">igitur C vbi ad imum deſcendit iterum videtur aſcen
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dere tùm propter determinationem nouam; </
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>
<
s
id
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N258A7
">tùm quia ab oppoſito pun
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cto deſcendente quaſi attollitur: </
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<
s
id
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">non dixi aſcendere, ſed tantùm videri
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aſcendere, quia reuerâ non aſcendit; </
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<
s
id
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">alioquin aliquod punctum regrede
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retur, quod falſum eſt; nec enim poteſt aſcendere, niſi regrediatur, vt
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conſtat. </
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<
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Theorema
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10.
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Hinc non deſtruitur ille impetus ab impetu innato, vt fit in funependulis
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; </
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<
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id
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">
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quia ſcilicet deſtruitur tantùm ab innato in aſcenſu; </
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<
s
id
="
N258D9
">ſed nullum pun
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ctum globi aſcendit, vt dictum eſt, quod vt meliùs intelligatur, ſit in fi
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gura Th. 1. globus centro O; </
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>
<
s
id
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N258E1
">ſitque OF perpendicularis deorſum, quæ
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percurritur ab eodem centro O motu centri; </
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<
s
id
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">ſitque motus orbis ab L
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in
<
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q;
">que</
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>
intelligatur autem planium AI 6; </
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>
<
s
id
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">certè punctum A, quod perinde
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ſe habet, atque ſi eſſet punctum contactus, deſcribit lineam ARP ergo
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non aſcendit; igitur non deſtruitur impetus productus ab impetu in
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nato. </
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Scholium.
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<
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<
s
id
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">Obſeruabis 1°. </
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>
<
s
id
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N2590E
">mirificam eſſe impetus propagationem in hoc motu;
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quippe omnes partes mouentur inæquali motu, licèt moueantur à prin
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cipio intrinſeco. </
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<
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<
s
id
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">1. Non tantum accelerari motum centri, ſed etiam motum orbis, vt
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patet experientiâ in globo deſcendente per decliue planum. </
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<
s
id
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">3. Si globus non deſcendat in plano declini ſed in libero aëre poſt
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primam librationem motus orbis non creſcit; </
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>
<
s
id
="
N25929
">quia omnes partes ten
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dere poſſunt deorſum, nec ab vllo obice impediuntur; non eſt autem
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par ratio pro motu in plano decliui, vt patet. </
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>
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<
s
id
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">4. Hinc motus orbis ſenſim deceſcit, ſed omninò inſenſibiliter; </
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>
<
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id
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N25937
">
<
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quia non deſtruitur ab impetu innato, vt iam dictum eſt; </
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>
<
s
id
="
N2593C
">nec enim ſic
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motus circularis eſt contrarius motui recto; </
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>
<
s
id
="
N25942
">quippe modò centrum
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grauitatis globi feratur motu recto, hoc ſatis eſſe videtur, ſiue partes mo
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tu circulari ferantur: circa idem centrum, ſiue omnes motu recto per
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lineas parallelas ferantur:</
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>
<
s
id
="
N25943
">ratio à priori eſt, quia in tantum vnus impe
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tus deſtruit alium in eadem parte mobilis, in quantum impeditur ab eo
<
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/>
eius motus deorſum totius globi nullo modo impeditur ab illo motu
<
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circulari, quia globus æquè citò deſcendit vno, atque alio motu, vt con
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ſtat mille experientiæ. </
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<
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Theorema
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11.
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Si corporis grauis altera extremitas ſit grauior demittaturque in eo ſitu,
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