Fabri, Honoré
,
Tractatus physicus de motu locali
,
1646
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<
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tur per horizontalem, quæ conueniat cum eadem linea directionis,
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iactus eſt longior toto illo ſpatio, quod nauis decurrit, dum iactus
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durat; </
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<
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id
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">breuior tamen, ſi in partem oppoſitam fiat iactus in hoc ca
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ſu, ſi nauis æqualem impetum imprimeret, deorſum rectà ferretur
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mobile motu naturali; </
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<
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id
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">imò ſagitta poſſet retorqueri in iaculatorem: </
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ſi terra eſſet vtrimque peruia, lapis demiſſus per multa annorum
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millia libraretur; non tamen eſſet motuus perpetuus. </
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De motu reflexo.
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<
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">1. MOtus reflexi vera cauſa eſt impetus prior, ad nouam li
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neam determinatus ab occurrente obice; </
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>
<
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N10A9B
">planum refle
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ctens eſt cauſa nouæ determinationis ſuo modo; </
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<
s
id
="
N10AA1
">cauſam enim di
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co eam, ex qua aliquid ſequitur: </
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<
s
id
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N10AA7
">ex gemina determinatione, noua,
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ſcilicet, per ipſam perpendicularem erectam in puncto contactus,
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& priore per lineam incidentiæ, ab eodem puncto contactus pro
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pagatam, fit determinatio mixta per lineam reflexionis; </
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>
<
s
id
="
N10AB1
">quæ omnia
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patent ex terminis: </
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>
<
s
id
="
N10AB7
">hinc nullus impetus producitur à plano refle
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ctente; </
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>
<
s
id
="
N10ABD
">quippe prior poteſt determinari ad nouam lineam: adde,
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quòd planum, quod caret impetu, impetum producere non poteſt. </
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<
s
id
="
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">2. Imò nihil impetus deſtruitur in reflexione pura per ſe; </
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<
s
id
="
N10AC9
">quia ni
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hil impetus eſt fruſtrà per ſe in pura reflexione; </
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>
<
s
id
="
N10ACF
">multus tamen im
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petus deſtruitur per accidens, tùm ab ipſo attritu tùm mollitie
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& ceſſione, tùm preſſione: </
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>
<
s
id
="
N10AD7
">hinc ſuppoſito eodem iactu, perpendi
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cularis reflexa eſt omnium reflexarum minima; </
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>
<
s
id
="
N10ADD
">quia per eam li
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neam maximus ictus infligitur; </
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>
<
s
id
="
N10AE3
">igitur maxima eſt partium colliſio,
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& preſſio: hinc etiam corpora duriora longiùs reflectuntur, per ipſam
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quoque
<
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="
perpendicularẽ
">perpendicularem</
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>
, dum planum reflectens ſit æquè durum. </
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>
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<
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">3. Determinatio noua dupla eſt prioris, poſita linea incidentiæ
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perpendiculari, & poſito etiam plano reflectente immobili; </
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>
<
s
id
="
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">quia
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alioquin anguli reflexionis non eſſent æquales angulis incidentiæ: </
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>
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ſi globus reflectens ſit æqualis impacto, æqualis eſt ceſſio reſiſtenciæ
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cùm ſit æquale agens reſiſtenti, perid enim reflectens reſiſtit, per
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quod eſt: </
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>
<
s
id
="
N10B06
">igitur, ſi æqualis reſiſtit, & cedit, certè æqualiter ce
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/>
dit, & reſiſtit: </
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>
<
s
id
="
N10B0C
">hinc noua determinatio æqualis eſt priori: </
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>
<
s
id
="
N10B10
">hinc glo
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lb
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bus impactis ſiſtit immobilis; quia ex duabus determinationibus
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oppoſitis neutra præualet. </
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>
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</
section
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</
front
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</
text
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