Newton, Isaac, Philosophia naturalis principia mathematica, 1713

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1ut angulus VCpad angulum VCP.Igitur eodem tempore quo
corpus Pmotu ſuo utroque pervenit ad punctum K,corpus pæ­
quali in centrum motu æqualiter movebitur a pverſus C,adeoque
completo illo tempore reperietur alicubi in linea mkr,quæ per
punctum kin lineam pCperpendicularis eſt; & motu tranſverſo
acquiret diſtantiam a linea pC,quæ ſit ad diſtantiam quam cor­
pus alterum Pacquirit a linea PC,ut eſt motus tranſverſus cor­
poris pad motum tranſverſum corporis alterius P.Quare cum
kræqualis ſit diſtantiæ quam corpus Pacquirit a linea PC,ſitque
mrad krut angulus VCpad angulum VCP,hoc eſt, ut motus
tranſverſus corporis pad motum tranſverſum corporis P,manife­
ſtum eſt quod corpus pcompleto illo tempore reperietur in loco
m.Hæc ita ſe habebunt ubi corpora p& Pæqualiter ſecundum
lineas pC& PCmoventur, adeoque æqualibus Viribus ſecundum
lineas illas urgentur.
Capiatur autem angulum pCnad angulum
pCkut eſt angulus VCpad angulus VCP,ſitque nCæqualis
kC,& corpus pcompleto illo tempore revera reperietur in n; ad­
eoque Vi majore urgetur quam corpus P,ſi modo angulus mCp
angulo kCpmajor eſt, id eſt ſi Orbis upkvel movetur in con­
ſequentia, vel movetur in antecedentia majore celeritate quam
ſit dupla ejus qua linea CPin conſequentia fertur; & Vi mino­
re ſi Orbis tardius movetur in antecedentia.
Eſtque Virium dif­
ferentia ut loeorum intervallum mn,per quod corpus illud p
ipſius actione, dato illo temporis ſpatio, transferri debet.
Centro
Cintervallo Cnvel Ckdeſcribi intelligatur Circulus ſecans
lineas mr, mnproductas in s& t,& erit rectangulum mnXmtæ­
quale rectangulo mkXms,adeoque mnæquale (mkXms/mt). Cum
autem triangula pCk, pCndentur magnitudine, ſunt kr& mr,
earumQ.E.D.fferentia mk& ſumma msreciproce ut altitudo pC,
adeoque rectangulum mkXmseſt reciproce ut quadratum altitudi­
nis pC.Eſt & mtdirecte ut 1/2 mt,id eſt, ut altitudo pC.Hæ
ſunt primæ rationes linearum naſcentium; & hinc fit (mkXms/mt), id
eſt lineola naſcens mn,eique proportionalis Virium differentia reci­
proce ut cubus altitudinis pC. que E. D.
LIBER
PRIMUS.
Corol.1. Hinc differentia virium in locis P& pvel K& k,eſt
ad vim qua corpus motu Circulari revolvi poſſit ab Rad Keodem
tempore quo corpus Pin Orbe immobili deſcribit arcum PK,ut
lineola naſcens mnad ſinum verſum arcus naſcentis RK,id eſt

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