Fabri, Honoré
,
Tractatus physicus de motu locali
,
1646
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duobus præſertim conſiſtit; </
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<
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">primò, eò quòd medium detrahat ali
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quid grauitationis corporis grauis; </
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<
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">ſecundò, eò quòd partes medij
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aliquam implicationem habeant, quæ ſolui non poteſt ſine aliqua
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compreſſione, vel tenſione; </
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<
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id
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">vtraque autem reſiſtit impetui: quod
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ſpectat ad primum, ſi medium ſit æqualis grauitatis cum ipſo cor
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pore, detrahitur tota grauitatio, ſi ſubduplæ ſubduplum, &c. </
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<
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aliàs. </
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<
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">8. Hinc corpus graue per medium rarius, cæteris paribus, fa
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cilè deſcendit; non tamen ex reſiſtentia medij cognita, poteſt co
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gnoſci proportio grauitatis vtriuſque, propter ſecundum caput, ex
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quo etiam petitur reſiſtentia. </
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<
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id
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">Idem corpus cum eodem medio
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comparatum, habet tres coniugationes: nam, vel eſt grauius, vel
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eſt grauius, vel æquè graue, vel minùs. </
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<
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N10524
">Sunt etiam tres aliæ con
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iugationes, ſcilicet, eiuſdem mobilis cum diuerſis mediis, duorum
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mobilium cum eodem medio, duorum mobilium cum duobus
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mediis. </
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<
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">9. Figura corporis grauis deorſum cadentis motum vel retardat
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vel accelerat; </
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<
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">retardat quidem, ſi plures partes medij amouendæ
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ſunt vel pauciores velociori motu; accelerat è contrario: </
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<
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">hinc idem
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corpus
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iuxta tres diuerſos ſitus, triplici motu diuer
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ſo deſcendere poteſt: hinc ratio, cur acuminata tam facilè deſcen
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dant. </
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<
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">Cubus, qui deſcendit, imprimit aëri velociorem motum,
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quàm ipſe habeat; & quò maior eſt eius ſuperficies, eò velociorem. </
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<
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">10. Duo globi, vel cubi eiuſdem materiæ æquè velociter deſ
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cendunt: </
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<
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">ratio eſt, quia, licèt maioris vires habeant maiorem pro
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portionem ad molem aëris reſiſtentis, quàm vires minoris ad alte
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ram aëris molem, quæ proprium illius motum retardat, cùm tamen
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aër, qui reſiſtit maiori cubo, debeat amoueri velociori motu, quàm
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aër, qui reſiſtit minori, ſitque eadem proportio reſiſtentiæ ratione
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motus, minoris ad maiorem, quæ eſt ratione molis, maioris ad mi
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norem; </
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<
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">certè ratio compoſita vtriuſque erit eadem in vtroque cu
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bo: igitur æqualiter deſcendet vterque. </
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<
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">11. Si tamen ſint diuerſæ materiæ, haud dubiè, qui conſtat leuio
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ri materia, tardiùs deſcendet; quia eius vires habent minorem
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proportionem ad reſiſtentiam. </
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<
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">Corpuſcula etiam ex grauiſſima ma
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teria tardiſſimè deſcendunt: </
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<
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">tum, quia à filamentis illis, quibus par
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tes aëris implicantur, facilè detinentur; </
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<
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">analogiam habes in lapil
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lo, qui ab araneæ tela intercipitur: </
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<
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">tum, quia, cùm latiſſimam ali
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quando habeant ſuperficiem pro modica mole, minimam habent </
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</
section
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</
front
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</
text
>
</
archimedes
>