Newton, Isaac
,
Philosophia naturalis principia mathematica
,
1713
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centro vis gravitantis) ſive alia aliqua quæ non apparet. </
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<
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>Mathe
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maticus duntaxat eſt hic conceptus. </
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<
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>Nam virium cauſas & ſedes phy
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ſicas jam non expendo. </
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<
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>Eſt igitur vis acceleratrix ad vim motricem ut celeritas ad mo
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tum. </
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<
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>Oritur enim quantitas motus ex celeritate ducta in quanti
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tatem materiæ, & vis motrix ex vi acceleratrice ducta in quantita
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tem ejuſdem materiæ. </
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<
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>Nam ſumma actionum vis acceleratricis in
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ſingulas corporis particulas eſt vis motrix totius. </
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<
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>Unde juxta
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ſuperficiem Terræ, ubi gravitas acceleratrix ſeu vis gravitans in
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corporibus univerſis eadem eſt, gravitas motrix ſeu pondus eſt ut
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corpus: at ſi in regiones aſcendatur ubi gravitas acceleratrix fit mi
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nor, pondus pariter minuetur, eritque ſemper ut corpus in
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gravitatem acceleratricem ductum. </
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<
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>Sic in regionibus ubi gravitas
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acceleratrix duplo minor eſt, pondus corporis duplo vel triplo
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minoris erit quadruplo vel ſextuplo minus. </
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<
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>Porro attractiones & impulſus eodem ſenſu acceleratrices & mo
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trices nomino. </
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<
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>Voces autem Attractionis, Impulſus, vel Propen
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ſionis cujuſcunQ.E.I. centrum, indifferenter & pro ſe mutuo pro
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miſcue uſurpo; has vires non Phyſice ſed Mathematice tantum con
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ſiderando. </
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<
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>Unde caveat lector, ne per hujuſmodi voces cogitet me
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ſpeciem vel modum actionis cauſamve aut rationem Phyſicam ali
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cubi definire, vel centris (quæ ſunt puncta Mathematica) vires
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vere & Phyſice tribuere; ſi forte aut centra trahere, aut vires cen
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trorum eſſe dixero. </
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Scholium.
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<
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>Hactenus voces minus notas, quo ſenſu in ſequentibus acci
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piendæ ſint, explicare viſum eſt. </
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<
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>Nam Tempus, Spatium, Locum
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& Motum, ut omnibus notiſſima, non definio. </
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<
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>Notandum tamen, quod
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vulgus quantitates haſce non aliter quam ex relatione ad ſenſibilia
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concipiat. </
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<
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>Et inde oriuntur præjudicia quædam, quibus tollendis
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convenit eaſdem in abſolutas & relativas, veras & apparentes, ma
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thematicas & vulgares diſtingui. </
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<
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>I. </
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<
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>Tempus Abſolutum, verum, & mathematicum, in ſe & natura
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ſua
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relatione ad externum quodvis, æquabiliter fluit,
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alioq;
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nomine dicitur Duratio: Relativum, apparens, & vulgare eſt ſenſibilis
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& externa quævis Durationis per motum menſura (ſeu accurata
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ſeu inæquabilis) qua vulgus vice veri temporis utitur; ut Hora,
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Dies, Menſis, Annus. </
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