Newton, Isaac
,
Philosophia naturalis principia mathematica
,
1713
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DEFINITIO III.
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Materiæ Vis Inſita eſt potentia reſiſtendi, qua corpus unumquodque,
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quantum in ſe eſt, perſeverat in ſtatu ſuo vel quieſcendi vel
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movendi uniformiter in directum.
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>Hæc ſemper proportionalis eſt ſuo corpori, neQ.E.D.ffert quic
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quam ab Inertia maſſæ, niſi in modo concipiendi. </
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>Per inertiam
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materiæ, fit ut corpus omne de ſtatu ſuo vel quieſcendi vel moven
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di difficulter deturbetur. </
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>Unde etiam vis inſita nomine ſignifican
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tiſſimo Vis Inertiæ dici poſſit. </
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>Exercet vero corpus hanc vim ſolum
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modo in mutatione ſtatus ſui per vim aliam in ſe impreſſam facta;
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exercitium ejus ſub diverſo reſpectu & Reſiſtentia & Impetus:
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reſiſtentia, quatenus corpus ad conſervandum ſtatum ſuum relucta
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tur vi impreſſæ; impetus, quatenus corpus idem, vi reſiſtentis ob
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ſtaculi difficulter cedendo, conatur ſtatum ejus mutare. </
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>Vulgus
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reſiſtentiam quieſcentibus & impetum moventibus tribuit: ſed mo
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tus & quies, uti vulgo concipiuntur, reſpectu ſolo diſtinguuntur
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ab invicem;
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ſemper vere quieſcunt quæ vulgo tanquam quie
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ſcentia ſpectantur. </
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DEFINITIO IV.
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Vis Impreſſa eſt actio in corpus exercita, ad mutandum ejus ſtatum
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vel quieſcendi vel movendi uniformiter in directum.
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>Conſiſtit hæc vis in actione ſola, neque poſt actionem permanet
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in corpore. </
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>Perſeverat enim corpus in ſtatu omni novo per ſolam
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vim inertiæ. </
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>Eſt autem vis impreſſa diverſarum originum, ut ex
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Ictu, ex Preſſione, ex vi Centripeta. </
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DEFINITIO V.
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Vis Centripeta eſt, qua corpora verſus punctum aliquod tanquam ad
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Centrum undique trahuntur, impelluntur, vel utcunque tendunt.
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<
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>Hujus generis eſt Gravitas, qua corpora tendunt ad centrum ter
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ræ; Vis Magnetica, qua ferrum petit magnetem; & Vis illa,
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ſit, qua Planetæ perpetuo retrahuntur a motibus rectili
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neis, & in lineis curvis revolvi coguntur. </
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>Lapis, in funda circum-</
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