Fabri, Honoré
,
Tractatus physicus de motu locali
,
1646
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<
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id
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">Dices cum graue aliquod mouetur deorſum, vel leue ſurſum, vel
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corpus animatum ſe ipſum mouet, dici poteſt ſubſtantia corporis cauſa
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immediata motus. </
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<
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">Reſp. negando, tùm quia omnis potentia motrix
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agit; </
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<
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">igitur producit aliquid aliud, quod eſt cauſa motus: præterea po
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tentia motrix corporis animati, agit vſque ad defatigationem, ſudorem,
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licèt non ſit motus, igitur aliud producit, de corpore graui probabi
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mus infrà. </
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Theorema
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6.
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Datur impetus.
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<
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"> Demonſtro, Subſtantia mobilis non eſt cauſa imme
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diata motus, per Th.5. ergo aliquid aliud; igitur impetus, nam quod di
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ſtinctum eſt à ſubſtantia mobilis, & exigit motum, eſt impetus per
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Def.3. ſed quia hoc Theorema eſt veluti princeps huius tractatus cardo,
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in eo paulò diutius hærendum eſt, igitur. </
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<
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">Demonſtro primò dari impetum: </
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">Quidquid eſt, & antè non erat, non
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eſt à ſe, ſed habet cauſam per Ax.8. Motus de nouo eſt per hypotheſim
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tertiam; </
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<
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">igitur habet cauſam, ſed non aliam, quam impetum, quod pro
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bo: </
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">Lapis cadens, vel impactus in alium lapidem mouet illum per hy
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poth.7. ſed ſubſtantia lapidis in alium impacti non eſt cauſa huius mo
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tus, quia eſſet cauſa neceſſaria vt patet; </
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<
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">igitur applicata eundem effe
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ctum produceret per Ax.12. ſed etiam applicata immediata non agit, vt
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conſtat experientia; igitur per idem Axioma non eſt cauſa. </
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<
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">Scio eſſe aliquas reſponſiones, quas infrà refellemus; nunc ſufficiat
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dixiſſe lapidem impactum non producere motum, qui propriè non pro
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ducitur per Th.2. nec exigere, vt conſtat ex ſecunda probatione Th. 5.
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igitur ſi aliquid exigit, vel producit, voco impetum. </
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<
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">Secundò probatur; potentia motrix eſt actiua, quia defatigatur, quis
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hoc neget? </
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<
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">igitur aliquid producit; </
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<
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">non motum, qui propriè non pro
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ducitur per Th.2. igitur aliquid aliud; voco impetum; </
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<
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ſine motu agit, & defatigatur vt iam dictum eſt; </
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<
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">igitur habet alium effe
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ctum immediatum; denique mouere, pellere, trahere, proiicere, percu
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tere, nihil niſi actionem ſonant. </
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<
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">Tertiò probatur; pila diſiuncta à manu proiicientis diu adhuc mo
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uetur per hypoth.6. igitur hic motus habet cauſam per Ax. 8. quælibet
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enim pars motus de nouo eſt, neque duæ illius partes ſimul eſſe poſſunt. </
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atqui potentia motrix non eſt cauſa per Ax.10. immò poteſt eſſe deſtru
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cta; igitur non eſt cauſa per Ax. 9. Non eſt etiam cauſa ſubſtantia pilæ
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mobilis per Th.5.5. nec priores pattes motus per reſp. </
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<
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">ad primam in
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ſtantiam Th 5. igitur aliquid aliud; voco impetum. </
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">Quartò probatur; </
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<
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">pila proiecta ſenſim ſine ſenſu tardiore motu
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mouetur; donec tandem moueri omnino deſinat per hypoth. </
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<
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">5. igitur
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non eſt ſemper æqualis, & eadem cauſa huius motus per Ax. 12. & 13.
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num.3. igitur cauſa huius motus eodem modo debilitatur, ſeu remitti
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tur, quo ipſe motus; </
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<
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">ſed decreſcit ſubſtantia mobilis, nec potentia mo-</
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