Fabri, Honoré
,
Tractatus physicus de motu locali
,
1646
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<
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<
text
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<
front
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<
section
>
<
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alio; </
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<
s
id
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N103A8
">quanquam impetus tantùm deſtruitur, cùm eſt fruſtrà: </
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>
<
s
id
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N103AC
">hinc, ſi
<
lb
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eſſet tantùm vnicus in eodem mobili, & liberum eſſet medium,
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nunquam deſtrueretur nec vnquam dici poſſet functus ſuo mune
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re; quod omninò gratis dicitur. </
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>
</
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<
s
id
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">8. Hinc, ſi ſint tantùm duo impetus in eodem mobili æquales
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verbi gratia, vel ad eandem lineam determinantur, vel ad diverſas; </
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<
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id
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N103BE
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<
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ſi ad eandem, nihil impetus deſtruitur, ſed eſt duplò velocior mo
<
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tus; </
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>
<
s
id
="
N103C5
">ſi ad diuerſas, vel ſunt oppoſitæ ex diametro, vel concurrentes
<
lb
/>
faciunt angulum; </
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>
<
s
id
="
N103CB
">ſi primum, vterque deſtruitur impetus; ſi ſe
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lb
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cundum, deſtruitur aliquid illius, quod determinabimus in
<
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frà. </
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>
<
s
id
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N103D3
">Impetus innatus nunquam deſtruitur: </
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>
<
s
id
="
N103D7
">dici poſſet grauitas ab
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lb
/>
ſoluta; ſaltem nihil eſt, quod diſtingui ab illa probare poſſit. </
s
>
<
s
id
="
N103DD
">Porrò
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nunquam deſtruitur; </
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>
<
s
id
="
N103E2
">quia nunquam eſt fruſtrà; quippe eius finis,
<
lb
/>
vel vſus, non eſt tantùm motus deorſum, ſed grauitatio, ſeu niſus
<
lb
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quidam deorſum. </
s
>
<
s
id
="
N103EA
">Sed de grauitate aliàs. </
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>
</
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>
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<
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type
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<
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<
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type
="
center
"/>
<
emph
type
="
italics
"/>
De motu naturali deorſum.
<
emph.end
type
="
italics
"/>
<
emph.end
type
="
center
"/>
</
s
>
</
p
>
<
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id
="
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type
="
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">
<
s
id
="
N10401
">1. DAtur motus naturalis grauium deorſum ab intrinſeco,
<
lb
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quippe non poteſt eſſe, vel à vi tractrice terræ vel fila
<
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mentis quibuſdam, vel materia quadam tenui expultrice. </
s
>
<
s
id
="
N10408
">Eius finis
<
lb
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eſt globi terreſtris compactio, &c. </
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>
<
s
id
="
N1040D
">Eſt autem motus naturalis ab
<
lb
/>
impetu: </
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>
<
s
id
="
N10413
">primò, quia eius acceleratio ſine impetu explicari non po
<
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/>
teſt: </
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>
<
s
id
="
N10419
">ſecundò, quia, cùm graue deorſum cadens imprimat impetum
<
lb
/>
in corpore occurrente, certè debet habere impetum: nec alio ar
<
lb
/>
gumento mihi probabis, Solem eſſe lucidum, ignem calidum. </
s
>
</
p
>
<
p
id
="
N10421
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type
="
main
">
<
s
id
="
N10423
">2. Motus hic eſt naturaliter acceleratus, ſcilicet, ab intrinſeco;
<
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/>
patet experientiâ. </
s
>
<
s
id
="
N10429
">Ratio eſt: </
s
>
<
s
id
="
N1042C
">quia, cùm in libero medio non impe
<
lb
/>
diatur motus, & impetus productus primo inſtanti non conſerue
<
lb
/>
tur ſecundo à cauſa primò productiua, ſed ab alia, ſitque ipſa mo
<
lb
/>
bilis ſubſtantia cauſa neceſſaria; </
s
>
<
s
id
="
N10436
">certè ſecundo inſtanti producit
<
lb
/>
nouum impetum: idem dica de tertio, quarto, &c. </
s
>
<
s
id
="
N1043C
">igitur creſcit
<
lb
/>
cauſa motus; </
s
>
<
s
id
="
N10442
">igitur & motus: quæ ratio clariſſima eſt: </
s
>
<
s
id
="
N10446
">hinc æquali
<
lb
/>
bus temporibus æqualia acquiruntur velocitatis momenta; </
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>
<
s
id
="
N1044C
">quia
<
lb
/>
cauſa neceſſaria æqualibus temporibus, æqualem effectum produ
<
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/>
cit: quid clarius? </
s
>
</
p
>
<
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id
="
N10454
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type
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main
">
<
s
id
="
N10456
">3. Hinc non poteſt creſcere hic impetus ſecundùm porportio-</
s
>
</
p
>
</
section
>
</
front
>
</
text
>
</
archimedes
>