Fabri, Honoré
,
Tractatus physicus de motu locali
,
1646
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cauimus; nam idem deſtruitur in dato puncto aſcenſus, qui producere
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tur in eodem puncto deſcenſus. </
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">Dices, gradus productus vltimo inſtanti deſcenſus non deſtruitur pri
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mo aſcenſus. </
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<
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">hinc eadem cauſa idem deſtruit primo
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inſtanti aſcenſus quod produxit vltimo inſtanti deſcenſus; deſtruit in
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quam mediatè. </
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">Hîc obſeruabis ſingulare diſcrimen, quod intercedit inter cauſam
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producentem, & exigentem; </
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s
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">nam producens verè agit, exigens verò tan
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tùm exigit; </
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<
s
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">illa conſequitur effectum eo inſtanti quo agit; </
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">hæc verò non
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habet effectum eo inſtanti, quo exigit, ſed pro ſequenti; </
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<
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eo inſtanti, quo exigit, non certè agens, ſed exigens: </
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in impetu, qui non habet motum eo inſtanti quo exigit, ſed tantùm ſe
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quenti pro quo exigit; </
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">igitur eſt cauſa motus antequàm ſit motus, non
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agens ſed exigens; at verò cum impetus alium impetum producit eſt
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tantùm cauſa illius cum agit. </
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Theorema
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82.
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Vltimo inſtanti aſcenſus ſunt duo gradus impetus, ſcilicet productus primo
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inſtanti deſcenſus cum innato
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; </
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">igitur inſtanti ſequenti erit motus, id eſt,
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deſcenſus, quia præualet innatus qui perfectior eſt, vt conſtat ex dictis; </
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igitur nullum erit inſtans quietis; quæ omnia explicari debent eodem
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modo, quo iam explicuimus in motu violento, lib.3. eſt enim eadem ra
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tio, &c. </
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">quæ omitto ne multa hîc repetere cogar. </
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Theorema
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83.
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Ictus eſſent ferè æquales in ſegmentis æqualibus aſcenſus & deſcenſus,
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quia
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motus eſſet æqualis in illis; igitur ictus æquales, quod facilè eſt. </
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Theorema
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84.
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In planis eiuſdem inclinationis idem corpus graue eſt eiuſdem ponderis
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v.
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g. ſint plana FE. GD. HO eiuſdem inclinationis cum communi ſci
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licet perpendiculo ODEA; </
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<
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id
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">certè pondus corporis in O eſt ad pondus
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eiuſdem in H vt AH ad AO per Th.57. & pondus corporis eiuſdem in
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D eſt ad pondus eiuſdem in G vt AG ad AD, & in E vt AF ad AE; </
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ſed AF eſt ad AE vt AG ad AD, vt AH ad AO; ſunt enim triangula
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proportionalia. </
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<
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">Hinc reiice quorumdam recentiorum ſententiam, qui volunt corpus,
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quod propiùs ad centrum terræ accedit, eſſe minùs graue, & grauius quod
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longiùs à centro recedit, quod de grauitate corporis abſolutè ſumpti nul
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latenus dici poteſt vt conſtat, vtrum verò ſi cum alio in eadem libra ſta
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tuatur hinc inde, videbimus ſuo loco. </
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<
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">Diceret fortè aliquis in ipſo centro ſpoliari ſua tota grauitate; </
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">igitur
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quo propiùs accedit ad centrum maiori grauitatis portione multatur; </
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<
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nego conſequentiam; </
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<
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abeſt à centro, licèt tota priuetur cum eſt in centro ſed de hac quæſtione
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plura aliàs; nec enim huius loci eſt. </
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