Fabri, Honoré
,
Tractatus physicus de motu locali
,
1646
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plani reflectentis; Secundò aër reſiliens; </
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<
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">Tertiò ſectio ipſa, vt ſic lo
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quar, diuiſionis, ſeu conflictus aliarum partium: idem, cæteris paribus, de
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lapide, cuius mille particulæ reſiliunt. </
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Theorema
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93.
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Globus reflectens, qui ab ictu alterius mouetur, non mouetur ipſo instanti con
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tactus
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; prob. </
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<
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id
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">quia eo primum inſtanti ab alio globo accipit impetum; ſed
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primo inſtanti, quo eſt impetus, non eſt motus, vt demonſtratum eſt lib.
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1.igitur globus reflectens, &c. </
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<
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<
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">Secundò inſtans; vnde
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vno tantùm inſtanti contactus eſt. </
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Theorema
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94.
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Hinc colligo produci illum impetum ipſo inſtanti contactus
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; </
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<
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ti ſequenti non eſſet motus; </
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<
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quippe, ſi tantùm ſecundo inſtanti produceretur, fieret contactus in duo
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bus inſtantibus; igitur eſſet quies. </
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Theorema
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95.
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Figura corporis impacti variare poteſt reflexionem
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; ſi enim corpus impa
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ctum ſit parallelipedum v. g. multiplex eſſe poteſt reflexionis variatio
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pro diuerſo appulſu, vt conſideranti patebit. </
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Theorema
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96.
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Si impetus eſſet tantùm determinatus ad vnam lineam; </
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">nulla daretur re
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flexio
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; patet, quia nulla daretur cauſa reflexionis, quæ tantùm eſt impe
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tus prior ad nouam lineam determinatus ratio plani oppoſiti. </
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Theorema
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97.
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Quò angulus incidentiæ eſt obliquior, faciliùs fit reflexio
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; </
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<
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">quia minor por
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tio impetus deſtruitur quamuis per accidens; </
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<
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">igitur motus propagatur
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faciliùs; adde quod noua determinatio minùs recedit à priori. </
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Scholium.
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<
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">Primò obſeruabis cauſæ reflexionis eſſe multiplices; </
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">ſcilicet planum
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reflectens, priorem impetum permanentem, nouam determinationem: </
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plano verò reflectente conſiderantur impenetrabilitas, durities, & im
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mobilitas: </
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<
s
id
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">in priore impetu conſideratur capacitas ad nouam lineam
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motus, & ſufficiens intenſio ad hoc, vt aliquid impetus ab ictu vel con
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tactu remaneat; </
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>
<
s
id
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">denique noua determinatio, ſi radius incidentiæ ſit
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perpendicularis, debet eſſe maior priore; </
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<
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">alioqui nulla erit reflexio; ſi
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verò linea incidentiæ ſit obliqua, poteſt eſſe maior, vel minor, vel
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æqualis. </
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<
s
id
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">Secundò obſeruabis veriſſimam cauſam reflexionis poſitam eſſe in de
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terminatione noua, ratione cuius poteſt eſſe motus; </
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<
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id
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">igitur impetus non
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eſt fruſtrà; igitur non debet deſtrui ſecundùm illam portionem, quæ
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non eſt fruſtrà. </
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