Gravesande, Willem Jacob 's
,
Physices elementa mathematica, experimentis confirmata sive introductio ad philosophiam Newtonianam; Tom. 1
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PHYSICES ELEMENTA
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<
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2.</
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s
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">Motus retardatus, eſt cujus celeritas omnibus momentis mi-
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nuitur.</
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<
s
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xml:space
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">Vis gravitatis in omnia corpora pro quantitate materiæ
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continuo agit , & </
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<
s
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xml:space
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">quæcunque fuerint, gravitate
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modo moventur. </
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primi momenti in ſecundo momento non deſtruitur; </
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<
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ſuperadditur impreſſio ſecundi momenti, & </
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<
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<
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">motus igitur corporis libere cadentis eſt acceleratus, & </
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Phænomenis conſtat motum æquabiliter in temporibus æ-
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qualibus accelerari; </
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<
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<
s
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xml:space
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">Unde ſequitur gravitatem eodem modo agere in corpus mo-
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tum ac in corpus quieſcens; </
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<
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">ideò celeritates æquales, in mo-
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mentis æqualibus, corpori communicat. </
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<
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">Unde celeritas,
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inter cadendum acquiſita, eſt ut tempus, in quo corpus ce-
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cidit. </
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pla, ſi tempus fuerit duplum; </
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<
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& </
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<
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<
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A. </
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">In triangulo ABE, lineæ 1f, 2g, 3h, quæ parallelæ ad
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fig. 8.</
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baſin, per puncta 1,2,3, ducuntur, ſunt inter ſe ut illarum
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diſtantiæ ab A, A1, A2, A3; </
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ſtantias deſignantur; </
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<
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">velocitates corporis libere cadentis
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poſt illa tempora denotant. </
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adhibeantur cum minima latitudine, unicuique æquali, non
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eo mutatur proportio; </
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<
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dictas velocitates denotant. </
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<
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pro æquabili haberi poteſt, & </
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<
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percurſum velocitati proportionale eſt , eædemque
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ſuperficies ſpatia minimis, ſed æqualibus, temporibus percur-
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ſa deſignare poterunt: </
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<
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cie memorata, ſi latitudo ſuperficiei pro tempore habeatur,
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ſuperficies ipſa ſpatium percurſum deſignabit. </
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<
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pus AB conſtat ex talibus temporibus minimis; </
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<
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anguli
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BE formatur ex ſumma omnium ſuperficierum mi-
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nimarum hiſce temporibus minimis reſpondentium: </
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