Fabri, Honoré, Tractatus physicus de motu locali, 1646

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          <chap id="N1137F">
            <pb pagenum="71" xlink:href="026/01/103.jpg"/>
            <p id="N15858" type="main">
              <s id="N1585A">Septimò, Impetus ſurſum deſtruitur etiam, quia eſt fruſtrà; </s>
              <s id="N1585E">quippe
                <lb/>
              naturalis detrahit aliquid ſpatij pro rata; </s>
              <s id="N15864">igitur ne aliquid impetus ſit
                <lb/>
              fruſtrà, deſtruitur; </s>
              <s id="N1586A">idem dico de impetu per inclinatam ſurſum, licèt
                <lb/>
              minùs deſtruatur quàm in perpendiculari ſurſum; </s>
              <s id="N15870">idem de impetu per
                <lb/>
              inclinatam deorſum, ſed minùs adhuc, ſed hæc acuratiori meditationi
                <lb/>
              ſunt relinquenda; </s>
              <s id="N15878">quod reuerâ præſtabimus in lib.4. de motu mixto; </s>
              <s id="N1587C">
                <lb/>
              quidquid ſit, conſtat ex dictis per idem Principium probari poſſe de­
                <lb/>
              ſtructionem impetus, ſcilicet ne ſit fruſtrà; ſed de his aliàs fusè. </s>
            </p>
            <p id="N15883" type="main">
              <s id="N15885">
                <emph type="center"/>
                <emph type="italics"/>
              Theorema
                <emph.end type="italics"/>
              153.
                <emph.end type="center"/>
              </s>
            </p>
            <p id="N15891" type="main">
              <s id="N15893">
                <emph type="italics"/>
              Impetus productus ab extrinſeco eſt tantùm contrarius ratione diuerſæ de­
                <lb/>
              terminationis, ſeu diuerſæ lineæ
                <emph.end type="italics"/>
              ; </s>
              <s id="N1589E">Probatur primò, quia vterque ad omnem
                <lb/>
              lineam eſt indifferens per Th.113. igitur vnus non eſt alteri contrarius
                <lb/>
              ratione entitatis; </s>
              <s id="N158A6">cùm vterque ſimilem motum, immò
                <expan abbr="eũdem">eundem</expan>
              habere
                <lb/>
              poſſit, vt patet ex dictis: </s>
              <s id="N158B0">Igitur ratione tantùm lineæ vnus alteri eſt
                <lb/>
              contrarius; hinc minùs eſt contrarietatis, quo minùs eſt oppoſitionis
                <lb/>
              inter lineas & contrà. </s>
            </p>
            <p id="N158B8" type="main">
              <s id="N158BA">
                <emph type="center"/>
                <emph type="italics"/>
              Theorema
                <emph.end type="italics"/>
              154.
                <emph.end type="center"/>
              </s>
            </p>
            <p id="N158C6" type="main">
              <s id="N158C8">
                <emph type="italics"/>
              Impetus naturalis acquiſitus eſt tantùm contrarius alteri extrinſeco ratio­
                <lb/>
              ne lineæ.
                <emph.end type="italics"/>
              </s>
              <s id="N158D1"> Probatur eodem modo; quia determinari poteſt ad omnem li­
                <lb/>
              neam, vt patet ex reflexione grauis cadentis. </s>
            </p>
            <p id="N158D6" type="main">
              <s id="N158D8">
                <emph type="center"/>
                <emph type="italics"/>
              Theorema
                <emph.end type="italics"/>
              155.
                <emph.end type="center"/>
              </s>
            </p>
            <p id="N158E4" type="main">
              <s id="N158E6">
                <emph type="italics"/>
              Impetus naturalis innatus non eſt tantùm contrarius ratione lineæ
                <emph.end type="italics"/>
              ; quia
                <lb/>
              ſcilicet non poteſt determinari ad omnem lineam, patet, alioquin cor­
                <lb/>
              pus graue, quod ſurſum poſt caſum reflectitur non deſcenderet amplius,
                <lb/>
              de quo aliàs, hæc enim curſim tantùm perſtringo, ne quid aliis libris
                <lb/>
              detrahatur. </s>
            </p>
            <p id="N158F7" type="main">
              <s id="N158F9">
                <emph type="center"/>
                <emph type="italics"/>
              Theorema
                <emph.end type="italics"/>
              156.
                <emph.end type="center"/>
              </s>
            </p>
            <p id="N15905" type="main">
              <s id="N15907">
                <emph type="italics"/>
              Impetus ex naturali acquiſito poteſt fieri violentus
                <emph.end type="italics"/>
              ; </s>
              <s id="N15910">vt patet in motu re­
                <lb/>
              flexo grauium; ratio eſt. </s>
              <s id="N15916">quia mutatur linea. </s>
            </p>
            <p id="N15919" type="main">
              <s id="N1591B">
                <emph type="center"/>
                <emph type="italics"/>
              Theorema
                <emph.end type="italics"/>
              157.
                <emph.end type="center"/>
              </s>
            </p>
            <p id="N15927" type="main">
              <s id="N15929">
                <emph type="italics"/>
              Impetus ex non contrario eidem fit contrarius
                <emph.end type="italics"/>
              ; </s>
              <s id="N15932">vt patet in eodem caſu;
                <lb/>
              nam impetus naturalis innatus, qui in deſcenſu non erat contrarius
                <lb/>
              acquiſito, in motu ſurſum reflexo fit contrarius. </s>
            </p>
            <p id="N1593A" type="main">
              <s id="N1593C">
                <emph type="center"/>
                <emph type="italics"/>
              Theorema
                <emph.end type="italics"/>
              158.
                <emph.end type="center"/>
              </s>
            </p>
            <p id="N15948" type="main">
              <s id="N1594A">
                <emph type="italics"/>
              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
                <lb/>
              trarius, id tantùm eſt ratione propagationis impetus acquiſiti, vel ac
                <lb/>
              celerationis motus; quod reuerà multa, & benè longâ explicatione indi­
                <lb/>
              get, quam conſule in lib.4. </s>
            </p>
            <p id="N1595B" type="main">
              <s id="N1595D">
                <emph type="center"/>
                <emph type="italics"/>
              Scholium.
                <emph.end type="italics"/>
                <emph.end type="center"/>
              </s>
            </p>
            <p id="N15969" type="main">
              <s id="N1596B">Obſeruabis cognoſci tantùm contrarietatem qualitatum ex mutua de­
                <lb/>
              ſtructione; </s>
              <s id="N15971">cur verò vna qualitas dicatur deſtruere aliam, & cur illam </s>
            </p>
          </chap>
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