Fabri, Honoré
,
Tractatus physicus de motu locali
,
1646
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<
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<
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">Septimò, Impetus ſurſum deſtruitur etiam, quia eſt fruſtrà; </
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<
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N1585E
">quippe
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naturalis detrahit aliquid ſpatij pro rata; </
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<
s
id
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N15864
">igitur ne aliquid impetus ſit
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fruſtrà, deſtruitur; </
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<
s
id
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N1586A
">idem dico de impetu per inclinatam ſurſum, licèt
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minùs deſtruatur quàm in perpendiculari ſurſum; </
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<
s
id
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N15870
">idem de impetu per
<
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inclinatam deorſum, ſed minùs adhuc, ſed hæc acuratiori meditationi
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ſunt relinquenda; </
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<
s
id
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N15878
">quod reuerâ præſtabimus in lib.4. de motu mixto; </
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<
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id
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N1587C
">
<
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quidquid ſit, conſtat ex dictis per idem Principium probari poſſe de
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ſtructionem impetus, ſcilicet ne ſit fruſtrà; ſed de his aliàs fusè. </
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<
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Theorema
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153.
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<
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<
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Impetus productus ab extrinſeco eſt tantùm contrarius ratione diuerſæ de
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terminationis, ſeu diuerſæ lineæ
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emph.end
type
="
italics
"/>
; </
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>
<
s
id
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N1589E
">Probatur primò, quia vterque ad omnem
<
lb
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lineam eſt indifferens per Th.113. igitur vnus non eſt alteri contrarius
<
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/>
ratione entitatis; </
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>
<
s
id
="
N158A6
">cùm vterque ſimilem motum, immò
<
expan
abbr
="
eũdem
">eundem</
expan
>
habere
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poſſit, vt patet ex dictis: </
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>
<
s
id
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N158B0
">Igitur ratione tantùm lineæ vnus alteri eſt
<
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contrarius; hinc minùs eſt contrarietatis, quo minùs eſt oppoſitionis
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inter lineas & contrà. </
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</
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<
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<
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<
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Theorema
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emph.end
type
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"/>
154.
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type
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</
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<
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">
<
emph
type
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"/>
Impetus naturalis acquiſitus eſt tantùm contrarius alteri extrinſeco ratio
<
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/>
ne lineæ.
<
emph.end
type
="
italics
"/>
</
s
>
<
s
id
="
N158D1
"> Probatur eodem modo; quia determinari poteſt ad omnem li
<
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neam, vt patet ex reflexione grauis cadentis. </
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>
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<
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<
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type
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Theorema
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emph.end
type
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155.
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</
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</
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<
s
id
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">
<
emph
type
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"/>
Impetus naturalis innatus non eſt tantùm contrarius ratione lineæ
<
emph.end
type
="
italics
"/>
; quia
<
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ſcilicet non poteſt determinari ad omnem lineam, patet, alioquin cor
<
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/>
pus graue, quod ſurſum poſt caſum reflectitur non deſcenderet amplius,
<
lb
/>
de quo aliàs, hæc enim curſim tantùm perſtringo, ne quid aliis libris
<
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detrahatur. </
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>
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<
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<
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type
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<
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Theorema
<
emph.end
type
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156.
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</
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</
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<
s
id
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N15907
">
<
emph
type
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italics
"/>
Impetus ex naturali acquiſito poteſt fieri violentus
<
emph.end
type
="
italics
"/>
; </
s
>
<
s
id
="
N15910
">vt patet in motu re
<
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flexo grauium; ratio eſt. </
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>
<
s
id
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N15916
">quia mutatur linea. </
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>
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<
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Theorema
<
emph.end
type
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157.
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</
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<
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<
s
id
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N15929
">
<
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type
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"/>
Impetus ex non contrario eidem fit contrarius
<
emph.end
type
="
italics
"/>
; </
s
>
<
s
id
="
N15932
">vt patet in eodem caſu;
<
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nam impetus naturalis innatus, qui in deſcenſu non erat contrarius
<
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acquiſito, in motu ſurſum reflexo fit contrarius. </
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>
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<
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<
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type
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<
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type
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Theorema
<
emph.end
type
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italics
"/>
158.
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type
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"/>
</
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</
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<
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id
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">
<
emph
type
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"/>
Impetus deorſum ab extrinſeco non eſt contrarius naturali innato ratione
<
lb
/>
lineæ,
<
emph.end
type
="
italics
"/>
quia ſcilicet eſt determinatus ad eandem lineam, ſi tamen eſt con
<
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/>
trarius, id tantùm eſt ratione propagationis impetus acquiſiti, vel ac
<
lb
/>
celerationis motus; quod reuerà multa, & benè longâ explicatione indi
<
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get, quam conſule in lib.4. </
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>
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<
s
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<
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<
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Scholium.
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</
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</
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>
<
p
id
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type
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<
s
id
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">Obſeruabis cognoſci tantùm contrarietatem qualitatum ex mutua de
<
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ſtructione; </
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>
<
s
id
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N15971
">cur verò vna qualitas dicatur deſtruere aliam, & cur illam </
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