Borelli, Giovanni Alfonso
,
De motionibus naturalibus a gravitate pendentibus
,
1670
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quemlibet, & ad quietem non difficiliùs nouus mo
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tus ei imprimitur, quando quieſcit, quàm quando
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actu mouetur. </
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<
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fuit in noſtro Ope
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re de Vi Percuſſionis: Imò ſi velimus philoſophari
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iuxtà ſenſus euidentiam, multoties experimur, quòd
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maiori difficultate imprimitur nouus motus in eo cor
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pore, quod actualitèr mouetur,
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quã
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ſi in quiete amo
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uibili conſtitutum fuiſſet, & hoc conſtat hac ratione:
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quia aut motus, qui de nouo imprimi debet, ab im
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pellente vergit, ac tendit ad eaſdem partes ad quas
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corpus mobile ferebatur, aut ad partes oppoſitas, vel
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tranſuersè; & patet, quod in his multò difficiliùs im
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primitur nouus motus, quia præter inertiam corpo
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ris mobilis, debet quoque ſuperari reſiſtentia impe
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tus motus contrarij, & ſic videmus, quòd difficiliùs
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reijcimus, & repercutimus pilam aduenientem, &
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nobis occurrentem motu contrario, quàm ſi eadem̨
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pila omninò motu careret, & pauimento innixa quie
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ſceret. </
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<
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">Si poſtea motus corporis mobilis, & mouen
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tis fiunt versùs eaſdem partes, atque velociori motu
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mobile, quàm mouens fertur, tunc patet adeò falſum
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eſſe faciliùs moueri poſſe corpus illud in motu velo
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ciori conſtitutum, quàm ſi quieſceret, vt è contrà iņ
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quiete ab illo impelli poſſet, at in fuga non poſſet à
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tardiore impulſore vrgeri; ſi verò gradus impetus
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mouentis corporis maior fuerit illo quo mobile
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ictũ
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fugit, tunc difficiliùs, ſeu tardiùs illud mouebitur,
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quàm ſi in quiete amouibili conſtitutum fuiſſet; nam
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in hoc caſu percuſſio fieret ab integro gradu impetus </
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