Newton, Isaac
,
Philosophia naturalis principia mathematica
,
1713
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ubi arcus illi in infinitum diminuuntur. </
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<
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>Nam hæ ſagittæ ſunt ſe
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miſſes diagonalium de quibus egimus in Corollario tertio. </
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DE MOTU
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CORPORUM</
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Corol.
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5. Ideoque vires eædem ſunt ad vim gravitatis, ut hæ ſa
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gittæ ad ſagittas horizonti perpendiculares arcuum Parabolieorum
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quos projectilia eodem tempore deſcribunt. </
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Corol.
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6. Eadem omnia obtinent per Legum Corol. </
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in quibus corpora moventur, una cum centris virium quæ in ipſis
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fita ſunt, non quieſcunt, ſed moventur uniformiter in directum. </
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PROPOSITIO II. THEOREMA II.
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Corpus omne, quod movetur in linea aliqua curva in plano de
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ſcripta, & radio ducto ad punctum vel immobile, vel motu rectili
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neo uniformiter progrediens, deſcribit areas circa punctum illud
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temporibus proportionales, urgetur a vi centripeta tendente ad idem
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punctum.
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Cas.
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1. Nam corpus omne quod movetur in linea curva, detor
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quetur de curſu rectilineo per vim aliquam in ipſum agentem (per
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Leg. </
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>1.) Et vis illa qua corpus de curſu rectilineo detorquetur, &
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cogitur triangula quam minima
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SAB, SBC, SCD,
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&c. </
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<
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punctum immobile
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S
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temporibus æqualibus æqualia deſcribere, a
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git in loco
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B
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ſecundum lineam parallelam ipſi
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cC
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(per Prop. </
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Lib. </
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>& Leg. </
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>11.) hoc eſt, ſecundum lineam
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BS
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; & in loco
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C
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ſecundum lineam ipſi
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dD
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parallelam, hoc eſt, ſecundum lineam
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SC,
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&c. </
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<
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illud immobile
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S.
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E. D.
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Cas.
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2. Et, per Legum Corollarium quintum, perinde eſt ſive
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quieſcat ſuperficies in qua corpus deſcribit figuram curvilineam,
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ſive moveatur eadem una cum corpore, figura deſcripta, & puncto
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ſuo
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S
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uniformiter in directum. </
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Corol.
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1. In Spatiis vel Mediis non reſiſtentibus, ſi areæ non ſunt
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temporibus proportionales, vires non tendunt ad concurſum radio
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rum; ſed inde declinant in conſequentia ſeu verſus plagam in quam
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fit motus, ſi modo arearum deſcriptio acceleratur: ſin retardatur, de
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clinant in antecedentia. </
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Corol.
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2. In Mediis etiam reſiſtentibus, ſi arearum deſcriptio accele
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ratur, virium directiones declinant a concurſu radiorum verſus plagam
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in quam ſit motus. </
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