Newton, Isaac, Philosophia naturalis principia mathematica, 1713

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                  SECTIO VII.
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                  De Motu Fluidorum & Reſiſtentia Projectilium.
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                  PROPOSITIO XXXII. THEOREMA XXVI.
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                  DE MOTU
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                  CORPORUM</s>
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                  Si Corporum Syſtemata duo ſimilia ex æquali particularum numero
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                  conſtent, & particulæ correſpondentes ſimiles ſint & propor­
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                  tionales, ſingulæ in uno Syſtemate ſingulis in altero, & ſimiliter
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                  ſitæ inter ſe, ac datam habeant rationem denſitatis ad invicem,
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                  & inter ſe temporibus proportionalibus ſimiliter moveri inci­
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                  piant, (eæ inter ſe quæ in uno ſunt Syſtemate & eæ inter ſe quæ
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                  ſunt in altero) & ſi non tangant ſe mutuo quæ in eodem ſunt
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                  Syſtemate, niſi in momentis reflexionum, neque attrahant vel fu­
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                  gent ſe mutuo, niſi viribus acceleratricibus quæ ſint ut particu­
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                  larum correſpondentium diametri inverſe & quadrata velocita.
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                  tum directe: dico quod Syſtematum particulæ illæ pergent inter
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                  ſe temporibus proportionalibus ſimiliter moveri.
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                  <s>Corpora ſimilia & ſimiliter ſita temporibus proportionalibus in­
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                  ter ſe ſimiliter moveri dico, quorum ſitus ad invicem in fine tem­
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                  porum illorum ſemper ſunt ſimiles: puta ſi particulæ unius Syſte­
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                  matis cum alterius particulis correſpondentibus conferantur. </s>
                  <s>Un­
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                  de tempora erunt proportionalia, in quibus ſimiles & proportiona­
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                  les Figurarum ſimilium partes a particulis correſpondentibus de­
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                  ſcribuntur. </s>
                  <s>Igitur ſi duo ſint ejuſmodi Syſtemata, particulæ cor­
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                  reſpondentes, ob ſimilitudinem incæptorum motuum, pergent ſi­
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                  militer moveri uſQ.E.D.nec ſibi mutuo occurrant. </s>
                  <s>Nam ſi nullis
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                  agitantur viribus, progredientur uniformiter in lineis rectis per mo­
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                  tus Leg. 1. Si viribus aliquibus ſe mutuo agitant, & vires illæ ſint
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                  ut particularum correſpondentium diametri inverſe & quadrata ve­
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                  locitatum directe; quoniam particularum ſitus ſunt ſimiles & vires
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                  proportionales, vires totæ quibus particulæ correſpondentes agi­
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                  tantur, ex viribus ſingulis agitantibus (per Legum Corollarium </s>
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