Gravesande, Willem Jacob 's
,
Physices elementa mathematica, experimentis confirmata sive introductio ad philosophiam Newtonianam; Tom. 1
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MATHEMATICA. LIB. I. CAP. XXV.
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communicandam eſſe vim, quæ proportionalis ſit quadrato
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A f, & </
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debere, ut quantitate A g poſſit minuere velocitatem AD,
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in hoc caſu corpus juxta directionem AD tantum ſuperſti-
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tem habebit vim proportionalem quadrato A b , cui ſi
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datur vis proportionalis quadrato A f, habemus vim
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tionalem quadrato AB; </
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<
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tis congruit .</
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velocitatis, non poſſe referri ad illam cum qua alia in ea-
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dem linea agit, facile ex ante demonſtratis ſequitur ,
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de causâ ubi vim in duas reſolvimus, hæ quadratis veloci-
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tatum proportionales non erunt, niſi ambarum directiones
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angulum rectum contineant ne aliter pro parte conſpirent
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aut contrarie agant . </
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<
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tam non iterum poſſe reſolvi. </
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in duos motus ejuſdem corporis per AD & </
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.
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fig 54.</
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quadratis velociratum ſunt proportionales; </
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AE iterum in duos per AF & </
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tinentes ſeparetur, non erunt hæ ultimæ quadratis veloci-
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tatum proportionales, & </
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in quo agitur de viribus, quæ non modo inter ſe non con-
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fpirant, neque contrarie agunt, ſed quæ cum tertiâ nil
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commune habent. </
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AB in tres motus reſolvitur per AD, AF & </
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bus AF & </
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contrariè agunt; </
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cari, cùm demonſtratio n. </
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">eadem ſit, ſive motus in re-
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folutione conſpirent, ſive contrarie agunt, ad vires non poſſe
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referri ex ante demonſtratis clarum eſt .</
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duobus, quorum unum in alios reſolvimus, ſed ita, ut poſt
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fig. 4. 5.</
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reſolutionem omnes motus darentur in duabus lineis, angu-
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lum rectum continentibus: </
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ſeparatim conſiderari potuere, quod nunquam fieri poteſt
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ubi motus varii in pluribus quàm duabus lineis dantur, </
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