Fabri, Honoré
,
Tractatus physicus de motu locali
,
1646
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conatu agat: </
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<
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id
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">immò ſi potentia motrix produceret motum primum, non
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impetum in corpore proiecto; </
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<
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id
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">nulla deinde eſſet cauſa applicata ad pro
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ducendum impetum: </
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<
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id
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">Itaque hic motus primi generis, ſi comparetur
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cum potentia motrice, eſt verè influxus, vel actio; </
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<
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">ſi cum termino, eſt
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eius fieri, ſeu dependentia; </
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<
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">ſi cum ſubiecto, ſeu mobili eſt paſſio; </
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<
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">nec
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propriè dicitur produci, niſi vt quo (vt vulgò loquuntur) nec enim
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actio eſt terminus, vel effectus, in quo ſiſtat cauſa; ſed eſt via, qua ten
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dit ad terminum. </
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<
s
id
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">Motus ſecundi generis eſt mutatio, ſeu tranſitus ex
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vno loco in alium; </
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<
s
id
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">hoc eſt finis, vel effectus formalis ſecundarius,
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quem exigit impetus; </
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<
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">& fruſtrà ponitur alia entitas, quæ tantùm eſſet
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inſtituta ad exigendam iſtam loci mutationem; Igitur ſi ſufficienter
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exigatur ab ipſo impetu, de quo infrà, certè fruſtra ponitur quodcun
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que aliud per Ax.3. & 7. </
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Theorema
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4.
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Cauſa illa immediata motus, quæ non est efficiens, potest tantùm eſſe exi
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gens, quæ reducitur ad formalem, quæ ſuum effectum formalem ſecundarium,
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id est ſuum finem intrinſecum exigit.
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</
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<
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"> Sic calor exigit rarefactionem, vel
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reſolutionem, impetus motum; </
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<
s
id
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">cum enim non ſit cauſa efficiens per Th.
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2. ſit tamen cauſa per Th.3. nec ſit materialis, nec finalis, vt conſtat, de
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bet eſſe formalis, vel exigens, ſeu exigitiua; </
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<
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">vt patet ex ipſa cauſarum
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enumeratione; </
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<
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">non eſt materialis, quia non recipit motum, niſi ab alio; </
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nec finalis, quæ ſupponit alias; cum ipſa non ſit dum ponitur
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effectus. </
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<
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Theorema
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5.
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Entitas ſeu ſubstantia mobilis non eſt cauſa immediata motus,
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Sit enim
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lapis proiectus per Poſtul. haud dubiè ſubſtantia lapidis non eſt cauſa
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huius motus; </
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<
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id
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">quia lapis tandem ſiſtit per hypoth.4. igitur non eſt cauſa
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motus, quia eſſet cauſa neceſſaria; </
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<
s
id
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">igitur ſemper cauſaret per Ax.12. præ
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terea potentia motrix proiicientis verè agit, cum etiam defatigetur; </
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<
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">igi
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tur aliquid producit, non motum immediatè, qui produci non poteſt pro
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prièper Th. 2. Adde quod motus ſecundi generis habet tantùm cauſam
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immediatam exigentem, ſed potentia motrix non exigit; </
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<
s
id
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">quia primò
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non defatigaretur exigendo; </
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<
s
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">ſecundò quia lapis ſeparatus à manu etiam
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mouetur, ſed non ad exigentiam potentiæ motricis, vt patet; </
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<
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">quia ſtatim
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poſt ſeparationem poteſt illa potentia deſtrui, licèt lapis longo pòſt
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tempore moueatur; ſed quod non eſt, nihil exigit. </
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<
s
id
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">Aliquis fortè diceret potentiam motricem exigere primam partem
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motus, quæ deinde ſecundam exigit, & ſecunda tertiam, tertia quar
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tam, &c. </
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<
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">Sed contra; </
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<
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">quæro quid ſit prima illa pars motus; </
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<
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">nec enim
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aliud agnoſco niſi primam mutationem loci, quæ mutatio non poteſt
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exigere niſi quando eſt; </
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<
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id
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">atqui quando eſt, nihil reale eſt actu niſi mo
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bile, & nouus locus acquiſitus, mobile ipſum non exigit, vt demonſtra
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tum eſt, & conceſſum, nec etiam locus de nouo acquiſitus, in quo
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ſcilicet mobile ſiſtere poteſt: quidquid pones aliud, impetum appellabo. </
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