Gravesande, Willem Jacob 's, Physices elementa mathematica, experimentis confirmata sive introductio ad philosophiam Newtonianam; Tom. 1

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        <div xml:id="echoid-div516" type="section" level="1" n="161">
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              <pb o="83" file="0139" n="152" rhead="MATHEMATICA. LIB. I. CAP. XXI."/>
            in utraque figura iiſdem literis deſignantur.</s>
            <s xml:id="echoid-s3486" xml:space="preserve"/>
          </p>
        </div>
        <div xml:id="echoid-div530" type="section" level="1" n="162">
          <head xml:id="echoid-head234" xml:space="preserve">CAPUT XXI.
            <lb/>
          De Viribus Centralibus.</head>
          <p>
            <s xml:id="echoid-s3487" xml:space="preserve">COrpus in motu, motum in linea recta continuat , &</s>
            <s xml:id="echoid-s3488" xml:space="preserve">
              <note symbol="*" position="right" xlink:label="note-0139-01" xlink:href="note-0139-01a" xml:space="preserve">140</note>
            ab ea non recedit, niſi impulſu novo agitetur; </s>
            <s xml:id="echoid-s3489" xml:space="preserve">poſt
              <lb/>
            impulſum motus eſt compoſitus, ex duobus naſcitur tertius
              <lb/>
            etiam in linea recta . </s>
            <s xml:id="echoid-s3490" xml:space="preserve">Si ergo corpus movetur in
              <note symbol="*" position="right" xlink:label="note-0139-02" xlink:href="note-0139-02a" xml:space="preserve">148.</note>
            omnibus momentis novo impulſu agitatur; </s>
            <s xml:id="echoid-s3491" xml:space="preserve">curva enim ad
              <lb/>
            rectas lineas revocari non poteſt, niſi concipiatur diviſa in
              <lb/>
            partes infinite exiguas. </s>
            <s xml:id="echoid-s3492" xml:space="preserve">Exemplum talis motus habemus in
              <lb/>
            projectione gravium ; </s>
            <s xml:id="echoid-s3493" xml:space="preserve">aliud habemus in omnibus
              <note symbol="*" position="right" xlink:label="note-0139-03" xlink:href="note-0139-03a" xml:space="preserve">316.</note>
            circa punctum quaſi centrum.</s>
            <s xml:id="echoid-s3494" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s3495" xml:space="preserve">Corpus quod continuò centrum aliquod verſus pellitur, ſi
              <lb/>
              <note position="right" xlink:label="note-0139-04" xlink:href="note-0139-04a" xml:space="preserve">342.</note>
            projiciatur ſecundum lineam quæ per illud centrum non
              <lb/>
            tranſit, curvam deſcrihit: </s>
            <s xml:id="echoid-s3496" xml:space="preserve">& </s>
            <s xml:id="echoid-s3497" xml:space="preserve">in omnibus punctis conatur ab
              <lb/>
              <note position="right" xlink:label="note-0139-05" xlink:href="note-0139-05a" xml:space="preserve">343.</note>
            illa curva recedere ſecundum directionem curvaturæ, id eſt,
              <lb/>
            tangentis ad curvam; </s>
            <s xml:id="echoid-s3498" xml:space="preserve">ita ut, ſi vis qua ad centrum trahitur,
              <lb/>
            ſubito ab actione ceſſaret, corpus in recta linea per tangen-
              <lb/>
            tem motum continuaret.</s>
            <s xml:id="echoid-s3499" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s3500" xml:space="preserve">Lapis fundæ impoſitus, & </s>
            <s xml:id="echoid-s3501" xml:space="preserve">in gyrum agitatus, curvam
              <lb/>
            deſcribit, quia funda manum verſus omnibus momen-
              <lb/>
            tis quaſi retrotrahitur; </s>
            <s xml:id="echoid-s3502" xml:space="preserve">ſi ſibi relinquatur per curvæ tangen-
              <lb/>
            tem recedit.</s>
            <s xml:id="echoid-s3503" xml:space="preserve"/>
          </p>
        </div>
        <div xml:id="echoid-div533" type="section" level="1" n="163">
          <head xml:id="echoid-head235" xml:space="preserve">
            <emph style="sc">Definitio</emph>
          1.</head>
          <p>
            <s xml:id="echoid-s3504" xml:space="preserve">Vis qua corpus in caſu prædicto a centro recedere cona-
              <lb/>
              <note position="right" xlink:label="note-0139-06" xlink:href="note-0139-06a" xml:space="preserve">344.</note>
            tur, qualis eſt vis qua funda agitata diſtenditur, vocatur vis
              <lb/>
            centrifuga.</s>
            <s xml:id="echoid-s3505" xml:space="preserve"/>
          </p>
        </div>
        <div xml:id="echoid-div535" type="section" level="1" n="164">
          <head xml:id="echoid-head236" xml:space="preserve">
            <emph style="sc">Definitio</emph>
          2.</head>
          <p style="it">
            <s xml:id="echoid-s3506" xml:space="preserve">Vis autem qua corpus centrum verſus trabitur, aut pelli-
              <lb/>
              <note position="right" xlink:label="note-0139-07" xlink:href="note-0139-07a" xml:space="preserve">345.</note>
            tur, vocatur vis centripeta.</s>
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          </p>
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        <div xml:id="echoid-div537" type="section" level="1" n="165">
          <head xml:id="echoid-head237" xml:space="preserve">
            <emph style="sc">Definitio</emph>
          3.</head>
          <p>
            <s xml:id="echoid-s3508" xml:space="preserve">Nomine communi vires hæ vocantur vires centrales.</s>
            <s xml:id="echoid-s3509" xml:space="preserve"/>
          </p>
          <note position="right" xml:space="preserve">346.</note>
          <p>
            <s xml:id="echoid-s3510" xml:space="preserve">In omni caſu vis centrifuga & </s>
            <s xml:id="echoid-s3511" xml:space="preserve">vis centripeta ſunt a qua-
              <lb/>
              <note position="right" xlink:label="note-0139-09" xlink:href="note-0139-09a" xml:space="preserve">347.</note>
            les inter ſe; </s>
            <s xml:id="echoid-s3512" xml:space="preserve">nam agunt contrarie & </s>
            <s xml:id="echoid-s3513" xml:space="preserve">ſeſe mutuo deſtruunt.</s>
            <s xml:id="echoid-s3514" xml:space="preserve"/>
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