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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>Disk</title> 0007 </head> 0008 <body> 0009 <p>A rigid disk with a unique name and the following parameters:</p> 0010 <ul> 0011 <li><b>position:</b> The X/Y position of the center of mass of the disk, relative to the center of the <a href="objinfo:World">world</a>.</li> 0012 <li><b>angle:</b> By how much the disk is rotated in positive direction, that is clock-wise.</li> 0013 <li><b>velocity:</b> The velocity of the center of mass of the disk. Unit: meters/second.</li> 0014 <li><b>angular velocity:</b> How fast the disk is spinning in positive direction, that is clock-wise.</li> 0015 <li><b>mass:</b> Total mass of the disk. This influences forces with which the disk interacts with other items.</li> 0016 <li><b>inertia:</b> How difficult it is to change the disk's rotation.</li> 0017 <li><b>momentum:</b> A fundamental quantity in mechanics that is conserved in the absence of external forces. A product of the mass and the velocity.</li> 0018 <li><b>angular momentum:</b> Measure of the extent to which the disk will continue to rotate unless acted upon by an external torque.</li> 0019 <li><b>kinetic energy:</b> The work needed to accelerate the body of a given mass from rest to its current velocity.</li> 0020 <li><b>radius:</b> Defines how big the disk is.</li> 0021 </ul> 0022 </body> 0023 </html>