Fabri, Honoré
,
Tractatus physicus de motu locali
,
1646
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versùs circumferentiam, non perfectior, patet per Th. 8. </
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Theorema
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98.
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Intenſio impetus propagati iuxta hunc modum ſe habet, vt distantia à cen
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tro motus
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; </
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<
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">ſint enim punctum B, & punctum A: </
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<
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">ita ſe habet intenſio
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impetus puncti A ad intenſionem impetus puncti B, vt diſtantia AC
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ad BC. Probatur, quia cum impetus ſint vt motus, motus vt ſpatia, ſpatia
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verò ſint arcus AE. BD; </
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<
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diſtantiæ quòd erat demonſtrandum. </
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Corollarium
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1.
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<
s
id
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">Hinc ſi diſtantia CA eſt dupla diſtantiæ CB, impetus in A eſt du
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plus impetus in B: at verò impetus ſegmenti eſt ad impetum alterius,
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vt diximus in Th. 73. </
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Corollarium
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2.
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<
s
id
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">Hinc hæc propagatio fit iuxta progreſſionem arithmeticam id eſt, ſi
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in primâ parte verſus centrum producitur impetus vt 1. in ſecunda pro
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ducitur vt duo, in tertiâ vt tria, atque ita deinceps; quia proportio
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arithmetica eſt laterum, ſeu linearum. </
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Corollarium
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3.
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</
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<
s
id
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">Hinc hæc propagatio eſt omninò inuerſa illius, quæ aliis qualitatibus
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competit, vt patet. </
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Corollarium
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4.
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<
s
id
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">Hinc etiam manifeſta ratio ſequitur illius experimenti, quod propo
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ſuimus corol. </
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<
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Corollarium
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5.
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<
s
id
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">Hinc ſi tantùm habeatur ratio impetus, facilè poteſt determinari in
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qua proportione cylindrus faciliùs moueatur motu recto, quàm motu
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circulari; </
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<
s
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">poſito ſcilicet centro motus in altera extremitate, cui applica
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tur potentia; </
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<
s
id
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N1488F
">quippe impetus propagatus in motu circulari eſt ſumma
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terminorum; </
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<
s
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">propagatus verò in motu recto eſt vltimus terminorum,
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v.g. ſint ſex puncta ſubiecti; </
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<
s
id
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">in quolibet producatur impetus vt vnum; </
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haud dubiè erit motus rectus; </
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<
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">vt verò ſit motus circularis in primo
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puncto; </
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<
s
id
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">producatur vt 1. in ſecundo vt 2. in tertio, vt 3. atque ita dein
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ceps; ſumma erit 21. cum tamen in motu recto eſſent tantùm 6. igitur
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vt ſe habent 21. ad 6. ita ſe habet facilitas motus recti ad facilitatem
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motus circularis. </
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">Dixi, ſi tantùm habeatur ratio impetus; </
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tationis, ſeu momenti; haud dubiè maior erit adhuc difficultas, de
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quo infrà in Schol.
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Corollarium
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6.
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<
s
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">Hinc quò longior eſt cylindrus, v. g. creſcit proportio maioris illius
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facilitatis, vt patet inductione; </
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<
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erit 3. ad 2.; </
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<
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