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0001 <!DOCTYPE html
0002 PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
0003 "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
0004 <html>
0005 <head>
0006 <title>Spring</title>
0007 </head>
0008 <body>
0009     <p>A flexible elastic object to store mechanical energy. It has a unique name and the following parameters:</p>
0010     <ul>
0011         <li><b>rest length:</b> is the length of the spring as it is not compressed or stretched.</li>
0012         <li><b>length:</b> is the initial spring length</li>
0013         <li><b>stiffness:</b> is the level of spring resistance to compression or stretching</li>
0014         <li><b>damping:</b> is level of spring ability to disperse stored energy, an internal viscosity</li>
0015         <li><b>body 1 and 2:</b> are the bodies to which the spring is fixed</li>
0016         <li><b>local position 1 and 2:</b> are the local positions of the spring ends relative to its center in the non-deformed state</li>
0017         <li><b>position 1 and 2:</b> are the global positions of the spring ends</li>
0018         <li><b>force:</b> is the force that acts along the spring</li>
0019     </ul>
0020 </body>
0021 </html>