Newton, Isaac
,
Philosophia naturalis principia mathematica
,
1713
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DE MOTU
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CORPORUM</
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Scholium.
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<
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>Si corpus aliquod perpendiculariter verſus planum datum tra
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hatur, & ex data lege attractionis quæratur motus corporis: Sol
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vetur Problema quærendo (per Prop. </
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<
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>XXXIX) motum corporis recta
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deſcendentis ad hoc planum, & (per Legum Corol. </
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>2.) componen
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do motum iſtum cum uniformi motu, ſecundum lineas eidem plano
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parallelas facto. </
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<
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>Et contra, ſi quæratur Lex attractionis in planum
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ſecundum lineas perpendiculares factæ, ea conditione ut corpus at
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tractum in data quacunque curva linea moveatur, ſolvetur Proble
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ma operando ad exemplum Problematis tertii. </
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<
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>Operationes autem contrahi ſolent reſolvendo ordinatim appli
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catas in Series convergentes. </
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>Ut ſi ad baſem A in angulo quovis
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dato ordinatim applicetur longitudo B, quæ ſit ut baſis dignitas
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quælibet A
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m/n
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; & quæratur vis qua corpus, ſecundum poſitionem
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ordinatim applicatæ, vel in baſem attractum vel a baſi fugatum,
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moveri poſſit in curva linea quam ordinatim applicata termi
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no ſuo ſuperiore ſemper attingit: Suppono baſem augeri parte
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quam minima O, & ordinatim applicatam —(A+O)
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m/n
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reſolvo in
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Seriem infinitam A
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m/n
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+
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m/n
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OA
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(
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m-n/n
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)
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+(
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mm-mn/2nn
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) OOA
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(
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m-2n/n
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)
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&c. </
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>at
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que hujus termino in quo O duarum eſt dimenſionum, id eſt, ter
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mino (
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mm-mn/2nn
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) OOA
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(
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m-2n/n
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)
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vim proportionalem eſſe ſuppono. </
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<
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>Eſt
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igitur vis quæſita ut (
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mm-mn/nn
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)A
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(
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m-2n/n
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)
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, vel quod perinde eſt, ut
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(
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mm-mn/nn
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)B
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(
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m-2n/m
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)
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. </
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>Ut ſi ordinatim applicata Parabolam attingat,
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exiſtente
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m
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=2, &
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n
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=1: fiet vis ut data 2B°, adeoQ.E.D.bi
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tur. </
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<
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>Data igitur vi corpus movebitur in Parabola, quemad
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modum
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Galilæus
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demonſtravit. </
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<
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>Quod ſi ordinatim applicata
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Hyperbolam attingat, exiſtente
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m
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=o-1, &
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n
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=1; fiet vis ut
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2A
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-3
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ſeu 2B
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3
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: adeoque vi, quæ ſit ut cubus ordinatim applicatæ,
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corpus movebitur in Hyperbola. </
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<
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>Sed miſſis hujuſmodi Propoſiti
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onibus, pergo ad alias quaſdam de Motu, quas nondum attigi. </
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