Gravesande, Willem Jacob 's
,
Physices elementa mathematica, experimentis confirmata sive introductio ad philosophiam Newtonianam; Tom. 1
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MATHEMATICA. LIB. I. CAP. XXI.
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in utraque figura iiſdem literis deſignantur.</
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<
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De Viribus Centralibus.</
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ab ea non recedit, niſi impulſu novo agitetur; </
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<
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impulſum motus eſt compoſitus, ex duobus naſcitur tertius
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etiam in linea recta . </
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<
s
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xml:space
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">Si ergo corpus movetur in
<
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omnibus momentis novo impulſu agitatur; </
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<
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rectas lineas revocari non poteſt, niſi concipiatur diviſa in
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partes infinite exiguas. </
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<
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xml:space
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">Exemplum talis motus habemus in
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projectione gravium ; </
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<
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xml:space
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">aliud habemus in omnibus
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circa punctum quaſi centrum.</
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<
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<
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">342.</
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projiciatur ſecundum lineam quæ per illud centrum non
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tranſit, curvam deſcrihit: </
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">& </
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<
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">343.</
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illa curva recedere ſecundum directionem curvaturæ, id eſt,
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tangentis ad curvam; </
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ſubito ab actione ceſſaret, corpus in recta linea per tangen-
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tem motum continuaret.</
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deſcribit, quia funda manum verſus omnibus momen-
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tis quaſi retrotrahitur; </
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<
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tem recedit.</
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<
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1.</
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<
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tur, qualis eſt vis qua funda agitata diſtenditur, vocatur vis
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centrifuga.</
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<
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2.</
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<
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tur, vocatur vis centripeta.</
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<
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3.</
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les inter ſe; </
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