Newton, Isaac
,
Philosophia naturalis principia mathematica
,
1713
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pagenum
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13
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LEX III.
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Actioni contrariam ſemper & æqualem eſſe reactionem: ſive cor
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porum duorum actiones in ſe mutuo ſemper eſſe æquales & in par
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tes contrarias dirigi.
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<
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>Quicquid premit vel trahit alterum, tantundem ab eo premitur
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vel trahitur. </
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>Si quis lapidem digito premit, premitur & hujus
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digitus a lapide. </
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<
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>Si equus lapidem funi alligatum trahit, retrahe
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tur etiam & equus (ut ita dicam) æqualiter in lapidem: nam funis
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utrinQ.E.D.ſtentus eodem relaxandi ſe conatu urgebit equum ver
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ſus lapidem, ac lapidem verſus equum; tantumQ.E.I.pediet pro
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greſſum unius quantum promovet progreſſum alterius. </
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<
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>Si corpus
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aliquod in corpus aliud impingens, motum ejus vi ſua quomodo
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cunque mutaverit, idem quoque viciſſim in motu proprio eandem
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mutationem in partem contrariam vi alterius ob æqualitatem preſ
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ſionis mutuæ) ſubibit. </
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<
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>His actionibus æquales fiunt mutationes,
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non velocitatum, ſed motuum; ſcilicet in corporibus non aliunde
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impeditis. </
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<
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>Mutationes enim velocitatum, in contrarias itidem
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partes factæ, quia motus æqualiter mutantur, ſunt corporibus re
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ciproce proportionales. </
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<
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>Obtinet etiam hæc Lex in Attractionibus,
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ut in Scholio proximo probabitur. </
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COROLLARIUM I.
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Corpus viribus conjunctis diagonalem parallelogrammi eodem tem
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pore deſcribere, quo latera ſeparatis.
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<
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M
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in loco
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A
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impreſſa, ferretur uNI
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formi cum motu ab
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A
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ad
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B
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; & vi
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ſola
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N
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in eodem loco impreſſa, fer
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retur ab
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A
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ad
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C:
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compleatur pa
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rallelogrammum
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ABDC,
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& vi utra
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que feretur id eodem tempore in diagonali ab
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A
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ad
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D.
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Nam quo
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niam vis
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N
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agit ſecundum lineam
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AC
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ipſi
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BD
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parallelam, hæc vis per
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Legem 11 nihil mutabit velocitatem accedendi ad lineam illam
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BD
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a vi altera genitam. </
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>Accedet igitur corpus eodem tempore ad lineam
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BD,
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ſive vis
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N
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imprimatur, ſive non; atque adeo in fine illius tempo
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ris reperietur alicubi in linea illa
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BD.
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Eodem argumento in fine tem
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poris ejuſdem reperietur alicubi in linea
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CD,
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& idcirco in utriuſque
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lineæ concurſu
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D
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reperiri neceſſe eſt. </
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<
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neo ab
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ad
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D
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per Legem 1. </
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