Fabri, Honoré
,
Tractatus physicus de motu locali
,
1646
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LIBER QVINTVS,
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DE MOTV IN DIVERSIS
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Planis.
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<
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">HACTENVS conſiderauimus motum in libe
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ro medio; iam verò conſiderabimus in planis
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durioribus, in quibus mobilè feratur vel ſua
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ſponte vel ab extrinſeco impulſum.
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DEFINITIO 1.
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PLanum inclinatum eſt corpus durum læuigatiſſimum, in quo mobile quod
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piam moueri poſſit, quod nec ſit verticale ſurſum, nec perpendiculare deor
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ſum,
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non addo, nec horizonti parallelum; quia planum rectilineum hori
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zontale eſt etiam decliue, vt ſuo loco videbimus. </
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Hypotheſis
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1.
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Corpus graue per planum inclinatum deſcendit, & quidem velociùs per illud
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planum, quod minùs recedit à perpendiculari, tardiùs verò per illud, quod plùs
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recedit.
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Hypotheſis
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2.
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Corpus graue in plano inclinato minùs grauitat, id eſt faciliùs ſustinetur, &
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tardiore motu deſcendit, quàm in perpendiculari deorſum.
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<
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">Vtraque hypotheſis certa eſt, & de vtraque ſupponimus tantùm, quòd
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ſit, nam demonſtrabimus infrà propter quid ſit. </
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Axioma
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1.
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Corpus graue ideò tantùm mouetur ſua ſponte, vt deorſum tendat
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: </
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">hoc
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Axioma conſtat ex iis, quæ fusè demonſtraui ſecundò lib. adde quod,
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deorſum tendere, & corpus graue ſua ſponte moueri idem prorſus ſonare
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videntur; </
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<
s
id
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">nec enim loquor de potentiâ motrice animantium, vel de alia
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quacumque magneticâ, ſed de potentiâ motrice grauium; </
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<
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">graue autem
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illud appello, quod in medio rariore poſitum deorſum tendit, niſi impe
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diatur, denique hîc ſuppono dari motum naturalem grauium deorſum </
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