Fabri, Honoré
,
Tractatus physicus de motu locali
,
1646
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<
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uis rarum, & tenue, quod aliquantulum non reſiſtat, vt clarum eſt; </
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<
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">tunc
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quoque eſt reſiſtentia ſine ceſſione, ſeu tota reſiſtentia, cum ipſum cor
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pus reſiſtens nullo modo cedit; </
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<
s
id
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">id eſt nullo modo mouetur ab ictu; </
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<
s
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">neque
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enim excogitari poteſt maior reſiſtentia; </
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<
s
id
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N1FA38
">denique tunc eſt æqualis ceſ
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ſio reſiſtentiæ, cum ipſum corpus, in quod aliud impingitur (vocetur re
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flectens) tantùm cedit quantum reſiſtit; </
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<
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id
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">cedit autem per motum; </
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<
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">igitur
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ſi reflectenti imprimitur æqualis motus ab impacto reflectens æqualiter
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cedit, & reſiſtit, ſi minor minùs cedit, & plùs reſiſtit, ſi nullus nullo mo
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do cedit, ſed tantùm reſiſtit; ſi maior plùs cedit, & minùs reſiſtit, ſcili
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cet in infinitum, donec tandem in vacuo ſit tantum ceſſio, nulla reſi
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ſtentia. </
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<
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<
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">Tertiò, tunc impactum motum æqualem imprimit reflectenti, cum
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impactum æquale eſt reflectenti, tùm mole, tùm pondere v.g. globus A
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impactus in globum B eiuſdem materiæ, & diametri, modo nullus fiat
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attritus partium, ſeu compreſſio, ſitque linea directionis connectens
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centra per punctum contactus, quod in primo libro iam demonſtratum
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eſt; </
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<
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">cum enim totus impetus globi A agat, & quantum poteſt; </
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<
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">certè pro
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ducit æqualem; </
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<
s
id
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">nec enim aliunde determinari poteſt æqualitas effectus
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quàm ab æqualitate cauſæ poſitis iiſdem circumſtantiis, & cum impetus
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in B impreſſus diſtribuatur tot partibus quot producens æqualis in A,
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vterque impetus eſt æquè intenſus; </
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<
s
id
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">igitur æquè velox motus per ſe; </
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<
s
id
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">cum
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per accidens aliquando ſecus accidat; </
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<
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">ſi verò reflectens ſit minor, idem
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impetus paucioribus partibus diſtribuitur; </
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<
s
id
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">igitur intenſior eſt; </
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>
<
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id
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">igitur
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velocior motus, ſecus verò cum maior eſt, donec tandem tanta ſit moles,
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vt plura ſint puncta in reflectente, quàm ſint in impacto puncta impe
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tus; tunc enim nullus imprimitur impetus, vt conſtat ex dictis lib. 1. </
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<
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<
s
id
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">Quartò, quod autem ſit æqualis reſiſtentia, & ceſſio globi B æqualis
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globo A etiam certum eſt; </
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<
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id
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">tùm quia, ſi æqualiter mouetur, æqualiter ce
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dit, vt iam dixi ſi æqualiter cedit, æqualiter reſiſtit; </
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<
s
id
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">nam quâ proportio
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ne minùs cedit, plùs reſiſtit; </
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<
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">igitur qua proportione ceſſio augetur, reſi
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ſtentia imminuitur: præterea cum reſiſtat per ſuam entitatem impene
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trabilem, duram &c. </
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<
s
id
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">certè ſi eſt æqualis entitas, eſt æqualis reſiſtentia; </
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quod etiam videmus in corporibus immerſis eiuſdem grauitatis cum
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medio, ita vt tot ſint partes impellentes, quot impulſæ; </
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<
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id
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">denique illud
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experimentum quo videmus globum A impactum in B æqualem per li
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neam connectentem centra immobilem ſiſtere, rem iſtam euincit; </
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<
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id
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">nam
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ideo ſiſtit, quia eſt æqualis determinatio noua priori; </
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<
s
id
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N1FACC
">nam vt ſe habet
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reſiſtentia reflectentis, ita ſe habet noua determinatio, quam ſuo modo
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confert impacto, vt ſuprà demonſtratum eſt: </
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<
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">& cùm ſint ad lineas op
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poſitas ex diametro hæ duæ determinationes, neutra præualere poteſt;
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igitur neceſſe eſt ſiſtere globum impactum. </
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<
s
id
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">Quintò, certum eſt determinationem nouam eſſe iuxta proportionem
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reſiſtentiæ, & hanc iuxta proportionem minoris ceſſionis; </
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<
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">vnde cum
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nulla eſt reſiſtentia, ſed tantùm ceſsio, nulla prorſus eſt noua determina
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tio igitur à termino nullius reſiſtentiæ, & totius ceſsionis ad terminum </
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