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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>