Newton, Isaac
,
Philosophia naturalis principia mathematica
,
1713
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tra petentium, & planis excentricis innitentium hic conſiderandus
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venit. </
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<
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>Plana autem ſupponimus eſſe politiſſima & abſolute lubrica
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ne corpora retardent. </
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>Quinimo, in his demonſtrationibus, vi
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ce planorum quibus corpora incumbunt quæque tangunt incum
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bendo, uſurpamus plana his parallela, in quibus centra corpo
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rum moventur & Orbitas movendo deſcribunt. </
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<
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>Et eadem lege
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Motus corporum in ſuperficiebus Curvis peractos ſubinde de
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terminamus. </
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DE MOTU
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CORPORUM</
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SECTIO X.
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De Motu Corporum in Superficiebus datis, deque Funipendulorum
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Motu reciproco.
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PROPOSITIO XLVI. PROBLEMA XXXII.
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Poſita cujuſcunque generis Vi centripeta, datoque tum Virium cen
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tro tum Plano quocunQ.E.I. quo corpus revolvitur, & conceſ
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ſis Figurarum curvilinearum quadraturis: requiritur Motus cor
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poris de loco dato, data cum Velocitate, ſecundum rectam in
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Plano illo datam egreſſi.
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<
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>Sit
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S
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centrum Virium,
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SC
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diſtantia minima centri hujus a Plano
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dato,
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P
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corpus de loco
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P
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ſecundum rectam
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PZ
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egrediens,
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Q
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corpus idem in Trajectoria ſua revolvens, &
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PQR
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Trajectoria
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illa, in Plano dato deſcripta, quam invenire oportet. </
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CQ
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QS,
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& ſi in
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QS
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capiatur
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SV
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proportionalis vi centripetæ qua
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corpus trahitur verſus centrum
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S,
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& agatur
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VT
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quæ fit parallela
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CQ
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& occurrat
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SC
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in
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T:
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Vis
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SV
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reſolvetur (per Legum Corol. </
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>2.)
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in vires
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ST, TV;
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quarum
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ST
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trahendo corpus ſecundum lineam
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plano perpendicularem, nil mutat motum ejus in hoc plano. </
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<
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autem altera
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TV,
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agendo ſecundum poſitionem plani, trahit cor
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pus directe verſus punctum
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C
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in plano datum, adeoque facit illud
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in hoc plano perinde moveri ac ſi vis
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ST
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tolleretur, & corpus vi
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ſola
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TV
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revolveretur circa centrum
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C
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in ſpatio libero. </
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<
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