Fabri, Honoré, Tractatus physicus de motu locali, 1646

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              Theorema
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              12.
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            <p id="N1CE8F" type="main">
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              Impetus naturalis aduentitius productus à corpore graui in plano inclinato
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              eſt minor eo, qui producitur in perpendiculari
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              ; </s>
              <s id="N1CE9C">probatur, quia eſt minor
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              motus, igitur minor impetus, vt ſæpè diximus; </s>
              <s id="N1CEA2">ſecundò (hæc eſt ratio
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              à priori;) quia cum ideo producatur impetus iſte aduentitius, vt motus
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              acceleretur; </s>
              <s id="N1CEAA">certè debet reſpondere motui, qui competit impetui innati; </s>
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              ſi enim nullum habet motum, nullus accedit de nouo impetus, è con­
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              tra verò ſi eſt motus, ſed maior, ſi maior eſt motus, & minor ſi eſt minor;
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              quia hic impetus tantùm eſt propter motum. </s>
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            <p id="N1CEB7" type="main">
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                <emph type="center"/>
                <emph type="italics"/>
              Theorema
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              13.
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              </s>
            </p>
            <p id="N1CEC5" type="main">
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              Impetus qui producitur in acceleratione motus habet totum motum quem
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              exigit (præſcindendo à reſiſtentia medij)
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              ; </s>
              <s id="N1CED2">nec enim per illum mobile graui­
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              tat in planum; </s>
              <s id="N1CED8">alioquin creſceret ſemper grauitatio; </s>
              <s id="N1CEDC">igitur totus exerce­
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              tur circa motum; </s>
              <s id="N1CEE2">ratio eſt quia hic impetus addititius non eſt inſtitutus
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              propter grauitationem, ſed tantùm propter motum: adde quod ad om­
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              nem lineam determinari poteſt, ſecùs verò naturalis ſaltem om­
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              ninò. </s>
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              Theorema
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              14.
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              </s>
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              Imminuitur motu illo grauitatio corporis in planum
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              ; ratio eſt primò; </s>
              <s id="N1CF05">quia
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              quò velociùs mouetur in plano, breuiori tempore ſingulis partibus in­
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              cumbit: </s>
              <s id="N1CF0D">ſecundò quia motu illo accelerato quaſi diſtrahitur mobile ab
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              illa linea grauitationis in planum; hinc mobile celeri motu moueretur
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              in plano illo inclinato, quod eiuſdem ſubſiſtentis grauitationi & ponde­
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              ri vltrò cederet. </s>
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            <p id="N1CF17" type="main">
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                <emph type="center"/>
                <emph type="italics"/>
              Theorema
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              15.
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              </s>
            </p>
            <p id="N1CF25" type="main">
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              Impetus innatus ex ſe eſt ſemper determinatus ad lineam perpendicularem
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              deorſum
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              ; </s>
              <s id="N1CF32">quia grauitas tendit ad commune centrum, vt videbimus tra­
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              ctatu ſequenti; </s>
              <s id="N1CF38">tamen ratione plani quaſi detorquetur ad lineam plani
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              ad quam tamen omninò non determinatur, alioquin non grauitaret in
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              planum: </s>
              <s id="N1CF40">vnde dixi, detorquetur ſeu quaſi diuiditur, perinde quaſi eſſet
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              duplex impetus, quorum alter per lineam perpendicularem deorſum
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              eſſet determinatus, in quo non eſt difficultas; impetus tamen aduenti­
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              tius determinatur omninò ad lineam plani. </s>
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            <p id="N1CF4A" type="main">
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              Scholium.
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                <emph.end type="center"/>
              </s>
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            <p id="N1CF58" type="main">
              <s id="N1CF5A">Dubitari poteſt an grauitatio in planum inclinatum ſit vt reſiduum
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              plani, cui detrahitur perpendiculum v.g. ſit planum inclinatum CD ad
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              angulum ACD 60. potentia quæ ſuſtinet pondus B per EB eſt ad præ­
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              dictum pondus vt CA ad CD; </s>
              <s id="N1CF66">detrahitur CA ex CD, ſupereſt FD æqua­
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              lis ſcilicet CA; </s>
              <s id="N1CF6C">an fortè grauitatio ponderis B in planum inclinatum C
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              D eſt ad grauitationem eiuſdem in planum horizontale; </s>
              <s id="N1CF72">quæ eſt graui­
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              tatio tota, id eſt nihil imminuta vt DF ad DC; </s>
              <s id="N1CF78">attollatur enim totum
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              triangulum CAD in eadem ſitu altera manu, & altera filo EB paralle-</s>
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