Gravesande, Willem Jacob 's
,
Physices elementa mathematica, experimentis confirmata sive introductio ad philosophiam Newtonianam; Tom. 1
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MATHEMATICA. LIB. I. CAP. XXIV.
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ergo actiones in eadem ratione ad partes oppoſitas; </
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eſt, ſunt in ratione inverſa corporum motorum, in qua ea-
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dem ratione ſunt velocitates corporibus communicatæ. </
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<
s
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">Caſus hic exſtat, ſi duo corpora elaſtica in ſe mutuo incur-
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rant velocitatibus quæ ſunt inversè ut maſſæ; </
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<
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xml:space
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">nam poſitis
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his non elaſticis, poſt ictum quieſcunt; </
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<
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xml:space
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">ergo in ipſo mo-
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mento concurſus, ante figuram inſtauratam, datur elaſte-
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rium flexum inter duo corpora quieſcentia. </
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<
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xml:space
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ideo hæc velocitatibus quæ ſunt inversè ut maſſæ
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id eſt, velocitates poſt ictum in eadem ſunt ratione in qua
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ante ictum erant; </
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<
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">unde ſequitur corpus utrumque redire
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eâdem velocitate quam ante ictum habuit, nam ſi minuatur
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in uno, non ſervabitur ratio niſi & </
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<
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re ſumma virium minor erit, quod impoſſibile ,
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ſtratio eadem eſt ſi quis unius corporis auctam velocitatem
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dicat.</
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<
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">Experimenta de corporibus elaſticis inſtituuntur alteru-
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trâ Machinarum ſuperius explicatarum, & </
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bis eburneis aut cylindris in fig. </
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tis.</
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<
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1.</
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tria, in ſe mutuo incurrunt, hoc velocitate quinque, illud
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fig. 9.</
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velocitate quindecim, poſt ictum utrumque ad eandem fe-
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rè à qua cecidit altitudinem redit.</
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<
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dem, à quibus cecidêre, redeant altitudines.</
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<
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">Quæ de elaſterio, inter corpora quieſcentia ſeſe expan-
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dente, demonſtrata ſunt, ad elaſterium inter corpora, eâdem
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cum his velocitate tranſlatum, & </
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<
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quieſcens, referri debent; </
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<
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ſtica velocitatibus, quæ ſunt inverſe ut maſſæ, in ſe mu-
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tuo impingant, velocitatibus iiſdem in nave redibunt.</
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BI fertur, corpora non elaſtica poſt ictum quieſcunt, & </
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fig. 1. 2.</
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mutationes in velocitatibus ſunt in versè ut maſſæ, </
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