Fabri, Honoré
,
Tractatus physicus de motu locali
,
1646
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quod demonſtratum eſt ſecundo lib. & verò ſi tibi adhuc non fiat ſatis,
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probetur hoc Axioma per hypotheſim primam; nam reuerâ ſuppono
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quòd omnibus experimentis comprobatur, ſcilicet corpus graue per pla
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num Inclinatum deorſum ſua ſponte deſcendere, non verò aſcendere niſi
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propter aliquam reflexionem. </
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Axioma
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2.
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Motus, qui impeditur, imminuitur, idque pro rata, & viciſſim impeditur
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qui imminuitur
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; cur enim imminueretur ſeu retardaretur, ſi nullum ſit
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impedimentum? </
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Axioma
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3.
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Omne quod impedit motum, debet eſſe applicatum mobili vel per ſe, vel
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per ſuam virtutem
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; hoc Axioma etiam certum eſt. </
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Poſtulatum.
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Liceat accipere in perpendiculari deorſum, parallelas, cum ſcilicet aſſumi
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tur modica altitudo
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; licèt enim non ſint parallelę, quia tamen inſenſibili
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interuallo ad ſeſe inuicem accedunt, pro parallelis accipiuntur. </
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Theorema
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1.
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Impeditur motus corporis in plano inclinato
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; certum eſt quod impedia
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tur, quia tardiore motu deſcendit mobile per hyp. </
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<
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per Axio.2. </
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Theorema
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2.
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Ideo impeditur, quia impeditur linea ad quam determinatus eſt impetus
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innatus
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; cum ſit determinatus ad lineam perpendicularem deorſum per
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Ax.1. cur enim potiùs ad vnam lineam quàm ad aliam? </
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tùm planum inclinatum efficit, vel impedit, ne deorſum rectà tendere
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poſſit; igitur ex eo tantùm capite impedit. </
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Theorema
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3.
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Non totus impeditur motus in plano inclinato
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; </
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nullus eſſet omninò motus ſuper eodem plano, ſed per planum inclina
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tum mobile deorſum mouetur per hyp.1.igitur totus motus non impedi
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tur; hinc ratio à priori primæ hypotheſeos. </
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Theorema
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4.
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In ea proportione minùs mouetur, in quæ plùs impeditur
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; </
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Axioma 2.cum enim motus imminuatur, quia impeditur per idem Axio
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ma; </
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tur, minor eſt, ergo quò plùs impeditur, minor eſt. </
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Theorema
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5.
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Eò plùs impeditur motus, quò maius ſpatium conficiendum eſt ad ac
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quirendam
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altitudinem, ſeu diſtantiam à centro, illo ſpatio,
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quod conficitur in perpendiculari deorſum
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; hoc Theor. vt clariùs
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demonſtretur, aliquid figuræ tribuendum eſt. </
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