Newton, Isaac
,
Philosophia naturalis principia mathematica
,
1713
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451 - 480
481 - 510
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DE MOTU
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CORPORUM</
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Corol.
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1. Et hinc facile colligitur, quod corporum ſimiles ſimi
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lium Figurarum partes temporibus proportionalibus deſcribentium
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Errores, qui viribus quibuſvis æqualibus ad corpora ſimiliter ap
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plicatis generantur, & menſurantur per diſtantias corporum a Fi
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gurarum ſimilium locis illis ad quæ corpora eadem temporibus iiſ
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dem proportionalibus abſque viribus iſtis pervenirent, ſunt ut qua
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drata temporum in quibus generantur quam proxime. </
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Corol.
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2. Errores autem qui viribus proportionalibus ad ſimiles
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Figurarum ſimilium partes ſimiliter applicatis generantur, ſunt ut
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vires & quadrata temporum conjunctim. </
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Corol.
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3. Idem intelligendum eſt de ſpatiis quibuſvis quæ corpo
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ra urgentibus diverſis viribus deſcribunt. </
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<
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>Hæc ſunt, ipſo motus iNI
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tio, ut vires & quadrata temporum conjunctim. </
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Corol.
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4. Ideoque vires ſunt ut ſpatia, ipſo motus initio, deſcripta
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directe & quadrata temporum inverſe. </
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Corol.
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5. Et quadrata temporum ſunt ut deſcripta ſpatia directe
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& vires inverſe. </
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Scholium.
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<
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>Si quantitates indeterminatæ diverſorum generum conferantur
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inter ſe, & earum aliqua dicatur eſſe ut eſt alia quævis directe vel
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inverſe: ſenſus eſt, quod prior augetur vel diminuitur in eadem
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ratione cum poſteriore, vel cum ejus reciproca. </
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dicatur eſſe ut ſunt aliæ duæ vel plures directe vel inverſe: ſenſus
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eſt, quod prima augetur vel diminuitur in ratione quæ componitur
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ex rationibus in quibus aliæ vel aliarum reciprocæ augentur vel di
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minuuntur. </
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<
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>Ut ſi A dicatur eſſe ut B directe & C directe & D in
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verſe: ſenſus eſt, quod A augetur vel diminuitur in eadem ratione
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cum BXCX1/D, hoc eſt, quod A & (BC/D) ſunt ad invicem in ratio
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ne data. </
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LEMMA XI.
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Subtenſa evaneſcens anguli contactus, in curvis omnibus curvatu
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ram finitam ad punctum contactus habentibus, est ultimo in ra
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tione duplicata ſubtenſæ arcus contermini.
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Caſ.
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1. Sit arcus ille
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AB,
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tangens ejus
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AD,
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ſubtenſa anguli con
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tactus ad tangentem perpendicularis
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BD,
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ſubtenſa arcus
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AB.
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Huic
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ſubtenſæ
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AB
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& tangenti
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AD
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perpendiculares erigantur
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AG, BG,
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