<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<!-- Created with Inkscape (http://www.inkscape.org/) -->
<svg
   xmlns:dc="http://purl.org/dc/elements/1.1/"
   xmlns:cc="http://web.resource.org/cc/"
   xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
   xmlns:svg="http://www.w3.org/2000/svg"
   xmlns="http://www.w3.org/2000/svg"
   xmlns:xlink="http://www.w3.org/1999/xlink"
   xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd"
   xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape"
   width="744.09448"
   height="700"
   id="svg2"
   sodipodi:version="0.32"
   inkscape:version="0.45"
   version="1.0"
   sodipodi:docname="Simple_gravity_pendulum2.svg"
   inkscape:output_extension="org.inkscape.output.svg.inkscape"
   sodipodi:docbase="C:\Documents and Settings\Administator\Desktop"
   sodipodi:modified="true">
  <defs
     id="defs4">
    <marker
       inkscape:stockid="Arrow1Mstart"
       orient="auto"
       refY="0.0"
       refX="0.0"
       id="Arrow1Mstart"
       style="overflow:visible">
      <path
         id="path7229"
         d="M 0.0,0.0 L 5.0,-5.0 L -12.5,0.0 L 5.0,5.0 L 0.0,0.0 z "
         style="fill-rule:evenodd;stroke:#000000;stroke-width:1.0pt;marker-start:none"
         transform="scale(0.4) translate(10,0)" />
    </marker>
    <marker
       inkscape:stockid="Arrow2Lstart"
       orient="auto"
       refY="0.0"
       refX="0.0"
       id="Arrow2Lstart"
       style="overflow:visible">
      <path
         id="path7217"
         style="font-size:12.0;fill-rule:evenodd;stroke-width:0.62500000;stroke-linejoin:round"
         d="M 8.7185878,4.0337352 L -2.2072895,0.016013256 L 8.7185884,-4.0017078 C 6.9730900,-1.6296469 6.9831476,1.6157441 8.7185878,4.0337352 z "
         transform="scale(1.1) translate(1,0)" />
    </marker>
    <marker
       inkscape:stockid="Arrow2Lend"
       orient="auto"
       refY="0.0"
       refX="0.0"
       id="Arrow2Lend"
       style="overflow:visible;">
      <path
         id="path7214"
         style="font-size:12.0;fill-rule:evenodd;stroke-width:0.62500000;stroke-linejoin:round;"
         d="M 8.7185878,4.0337352 L -2.2072895,0.016013256 L 8.7185884,-4.0017078 C 6.9730900,-1.6296469 6.9831476,1.6157441 8.7185878,4.0337352 z "
         transform="scale(1.1) rotate(180) translate(1,0)" />
    </marker>
    <marker
       inkscape:stockid="Arrow2Mend"
       orient="auto"
       refY="0"
       refX="0"
       id="Arrow2Mend"
       style="overflow:visible">
      <path
         id="path5256"
         style="font-size:12px;fill-rule:evenodd;stroke-width:0.625;stroke-linejoin:round"
         d="M 8.7185878,4.0337352 L -2.2072895,0.016013256 L 8.7185884,-4.0017078 C 6.97309,-1.6296469 6.9831476,1.6157441 8.7185878,4.0337352 z "
         transform="scale(-0.6,-0.6)" />
    </marker>
    <marker
       inkscape:stockid="Arrow2Mstart"
       orient="auto"
       refY="0"
       refX="0"
       id="Arrow2Mstart"
       style="overflow:visible">
      <path
         id="path5259"
         style="font-size:12px;fill-rule:evenodd;stroke-width:0.625;stroke-linejoin:round"
         d="M 8.7185878,4.0337352 L -2.2072895,0.016013256 L 8.7185884,-4.0017078 C 6.97309,-1.6296469 6.9831476,1.6157441 8.7185878,4.0337352 z "
         transform="scale(0.6,0.6)" />
    </marker>
    <linearGradient
       id="linearGradient3141">
      <stop
         style="stop-color:#ffffff;stop-opacity:1;"
         offset="0"
         id="stop3143" />
      <stop
         id="stop3149"
         offset="1"
         style="stop-color:#5f5f5f;stop-opacity:1;" />
    </linearGradient>
    <radialGradient
       inkscape:collect="always"
       xlink:href="#linearGradient3141"
       id="radialGradient3147"
       cx="477.14285"
       cy="622.36218"
       fx="477.14285"
       fy="622.36218"
       r="29.021427"
       gradientUnits="userSpaceOnUse" />
  </defs>
  <sodipodi:namedview
     id="base"
     pagecolor="#ffffff"
     bordercolor="#666666"
     borderopacity="1.0"
     gridtolerance="10000"
     guidetolerance="10"
     objecttolerance="10"
     inkscape:pageopacity="0.0"
     inkscape:pageshadow="2"
     inkscape:zoom="0.7"
     inkscape:cx="386.90889"
     inkscape:cy="415.79361"
     inkscape:document-units="px"
     inkscape:current-layer="layer1"
     showguides="true"
     inkscape:guide-bbox="true"
     height="700px"
     width="744.09448px"
     inkscape:window-width="1280"
     inkscape:window-height="900"
     inkscape:window-x="-4"
     inkscape:window-y="-4"
     inkscape:grid-points="false"
     inkscape:guide-points="true" />
  <metadata
     id="metadata7">
    <rdf:RDF>
      <cc:Work
         rdf:about="">
        <dc:format>image/svg+xml</dc:format>
        <dc:type
           rdf:resource="http://purl.org/dc/dcmitype/StillImage" />
      </cc:Work>
    </rdf:RDF>
  </metadata>
  <g
     inkscape:groupmode="layer"
     id="layer2"
     inkscape:label="Trajectory">
    <path
       sodipodi:type="arc"
       style="opacity:1;color:#000000;fill:none;fill-opacity:1;fill-rule:evenodd;stroke:#ff0000;stroke-width:5;stroke-linecap:butt;stroke-linejoin:miter;marker:none;marker-start:none;marker-mid:none;marker-end:none;stroke-miterlimit:4;stroke-dasharray:15, 15;stroke-dashoffset:0;stroke-opacity:1;visibility:visible;display:inline;overflow:visible;enable-background:accumulate"
       id="path4121"
       sodipodi:cx="370.71429"
       sodipodi:cy="153.79076"
       sodipodi:rx="478.57144"
       sodipodi:ry="478.57144"
       d="M 565.81403,590.78814 A 478.57144,478.57144 0 0 1 171.94002,589.12903"
       sodipodi:start="1.1508942"
       sodipodi:end="1.999123"
       sodipodi:open="true"
       transform="translate(-18.571429,-61.428571)" />
    <text
       xml:space="preserve"
       style="font-size:40px;font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;text-align:start;line-height:100%;writing-mode:lr-tb;text-anchor:start;fill:#0000ff;fill-opacity:1;stroke:none;stroke-width:1px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1;font-family:Arial"
       x="375.71426"
       y="103.79074"
       id="text5292"
       sodipodi:linespacing="100%"><tspan
         sodipodi:role="line"
         id="tspan5294"
         x="375.71426"
         y="103.79074">frictionless pivot</tspan></text>
    <text
       xml:space="preserve"
       style="font-size:40px;font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;text-align:start;line-height:100%;writing-mode:lr-tb;text-anchor:start;fill:#0000ff;fill-opacity:1;stroke:none;stroke-width:1px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1;font-family:Arial"
       x="433.57141"
       y="307.36224"
       id="text5296"
       sodipodi:linespacing="100%"><tspan
         sodipodi:role="line"
         x="433.57141"
         y="307.36224"
         id="tspan6273">massless rod</tspan></text>
    <text
       sodipodi:linespacing="100%"
       id="text6269"
       y="600.2193"
       x="489.28571"
       style="font-size:40px;font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;text-align:start;line-height:100%;writing-mode:lr-tb;text-anchor:start;fill:#0000ff;fill-opacity:1;stroke:none;stroke-width:1px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1;font-family:Arial"
       xml:space="preserve"><tspan
         y="600.2193"
         x="489.28571"
         id="tspan6271"
         sodipodi:role="line">massive bob</tspan></text>
    <path
       style="fill:#ff0000;fill-opacity:1;fill-rule:evenodd;stroke:none;stroke-width:1px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1"
       d="M 549.23768,538.11655 L 580.36899,513.60806 L 541.66593,521.15606 C 547.26607,524.61084 550.78976,530.84971 549.23768,538.11655 z "
       id="path6277"
       sodipodi:nodetypes="cccc" />
    <path
       sodipodi:nodetypes="cccc"
       id="path9186"
       d="M 160.56827,520.58782 L 121.72396,512.78115 L 152.56677,537.34984 C 151.56537,530.84643 154.02989,524.11841 160.56827,520.58782 z "
       style="fill:#ff0000;fill-opacity:1;fill-rule:evenodd;stroke:none;stroke-width:1px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1" />
    <text
       xml:space="preserve"
       style="font-size:40px;font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;text-align:start;line-height:100%;writing-mode:lr-tb;text-anchor:start;fill:#0000ff;fill-opacity:1;stroke:none;stroke-width:1px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1;font-family:Arial"
       x="38.57143"
       y="556.64795"
       id="text9190"
       sodipodi:linespacing="100%"><tspan
         sodipodi:role="line"
         id="tspan9192"
         x="38.57143"
         y="556.64795">bob's</tspan><tspan
         sodipodi:role="line"
         x="38.57143"
         y="596.64795"
         id="tspan9194">trajectory</tspan></text>
    <text
       xml:space="preserve"
       style="font-size:40px;font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;text-align:start;line-height:100%;writing-mode:lr-tb;text-anchor:start;fill:#0000ff;fill-opacity:1;stroke:none;stroke-width:1px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1;font-family:Arial"
       x="260"
       y="635"
       id="text4129"
       sodipodi:linespacing="100%"><tspan
         sodipodi:role="line"
         id="tspan4131"
         x="260"
         y="635">equilibrium</tspan><tspan
         sodipodi:role="line"
         x="260"
         y="675"
         id="tspan4133">position</tspan></text>
  </g>
  <g
     inkscape:label="Pendulum"
     inkscape:groupmode="layer"
     id="layer1">
    <path
       sodipodi:type="arc"
       style="opacity:1;color:#000000;fill:#000000;fill-opacity:1;fill-rule:evenodd;stroke:none;stroke-width:0.89999998;stroke-linecap:butt;stroke-linejoin:miter;marker:none;marker-start:none;marker-mid:none;marker-end:none;stroke-miterlimit:4;stroke-dasharray:none;stroke-dashoffset:0;stroke-opacity:1;visibility:visible;display:inline;overflow:visible;enable-background:accumulate"
       id="path2164"
       sodipodi:cx="371.42856"
       sodipodi:cy="155.21933"
       sodipodi:rx="12.857142"
       sodipodi:ry="12.857142"
       d="M 384.2857 155.21933 A 12.857142 12.857142 0 1 1  358.57142,155.21933 A 12.857142 12.857142 0 1 1  384.2857 155.21933 z"
       transform="matrix(0.8472222,0,0,0.8472222,39.424603,-37.178792)" />
    <path
       style="fill:none;fill-rule:evenodd;stroke:#000000;stroke-width:5;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:1"
       d="M 353.23748,93.813944 L 496.99712,517.89482"
       id="path2166"
       sodipodi:nodetypes="cc" />
    <path
       sodipodi:type="arc"
       style="opacity:1;color:#000000;fill:url(#radialGradient3147);fill-opacity:1;fill-rule:evenodd;stroke:#000000;stroke-width:0.89999998;stroke-linecap:butt;stroke-linejoin:miter;marker:none;marker-start:none;marker-mid:none;marker-end:none;stroke-miterlimit:4;stroke-dasharray:none;stroke-dashoffset:0;stroke-opacity:1;visibility:visible;display:inline;overflow:visible;enable-background:accumulate"
       id="path2168"
       sodipodi:cx="477.14285"
       sodipodi:cy="622.36218"
       sodipodi:rx="28.571428"
       sodipodi:ry="28.571428"
       d="M 505.71428 622.36218 A 28.571428 28.571428 0 1 1  448.57142,622.36218 A 28.571428 28.571428 0 1 1  505.71428 622.36218 z"
       transform="translate(30.714285,-77.857142)" />
    <path
       transform="translate(-124.28571,-50)"
       d="M 505.71428 622.36218 A 28.571428 28.571428 0 1 1  448.57142,622.36218 A 28.571428 28.571428 0 1 1  505.71428 622.36218 z"
       sodipodi:ry="28.571428"
       sodipodi:rx="28.571428"
       sodipodi:cy="622.36218"
       sodipodi:cx="477.14285"
       id="path2183"
       style="opacity:1;color:#000000;fill:none;fill-opacity:1;fill-rule:evenodd;stroke:#000000;stroke-width:2.3;stroke-linecap:butt;stroke-linejoin:miter;marker:none;marker-start:none;marker-mid:none;marker-end:none;stroke-miterlimit:4;stroke-dasharray:9.2,9.2;stroke-dashoffset:0;stroke-opacity:1;visibility:visible;display:inline;overflow:visible;enable-background:accumulate"
       sodipodi:type="arc" />
    <path
       style="fill:none;fill-rule:evenodd;stroke:#000000;stroke-width:2;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1;stroke-miterlimit:4;stroke-dasharray:8,8;stroke-dashoffset:0"
       d="M 352.85714,94.285714 L 352.85714,543.57143"
       id="path3158" />
    <path
       sodipodi:type="arc"
       style="opacity:1;color:#000000;fill:none;fill-opacity:1;fill-rule:evenodd;stroke:#0000ff;stroke-width:2;stroke-linecap:butt;stroke-linejoin:miter;marker:none;marker-start:url(#Arrow1Mstart);marker-mid:none;marker-end:none;stroke-miterlimit:4;stroke-dasharray:none;stroke-dashoffset:0;stroke-opacity:1;visibility:visible;display:inline;overflow:visible;enable-background:accumulate"
       id="path5104"
       sodipodi:cx="354.28571"
       sodipodi:cy="93.571426"
       sodipodi:rx="117.14286"
       sodipodi:ry="117.14286"
       d="M 387.80341,205.81675 A 117.14286,117.14286 0 0 1 353.47785,210.7115"
       sodipodi:start="1.2806142"
       sodipodi:end="1.5776927"
       sodipodi:open="true" />
    <text
       xml:space="preserve"
       style="font-size:40px;font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;text-align:start;line-height:100%;writing-mode:lr-tb;text-anchor:start;fill:#0000ff;fill-opacity:1;stroke:none;stroke-width:1px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1;font-family:Arial"
       x="169.28572"
       y="244.28572"
       id="text7246"
       sodipodi:linespacing="100%"><tspan
         sodipodi:role="line"
         id="tspan7248"
         x="169.28572"
         y="244.28572">amplitude</tspan></text>
    <text
       xml:space="preserve"
       style="font-size:40px;font-style:italic;font-variant:normal;font-weight:normal;font-stretch:normal;text-align:start;line-height:100%;writing-mode:lr-tb;text-anchor:start;fill:#0000ff;fill-opacity:1;stroke:none;stroke-width:1px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1;font-family:Arial"
       x="361.42859"
       y="248.57144"
       id="text8237"
       sodipodi:linespacing="100%"><tspan
         sodipodi:role="line"
         id="tspan8239"
         x="361.42859"
         y="248.57144">θ</tspan></text>
  </g>
</svg>
