The following simulation show gravitation field as function of r.<br />You can change the radius of the planet with the slider.<br />You can also drag mouse to any position and the simulation will show gravitation field at the new mouse position.<br />I hope this is what you need!<br /><p><applet code='users.ntnu.fkh.gravitationfnr_pkg.gravitationfnrApplet.class' codebase='ejsuser/2/' archive='ejs_gravitationfnr.jar' name='gravitationfnr8842' id='gravitationfnr8842' width='434' height='517' mayscript=true><param name='draggable' value='true'></applet></p><a href='ejstranslation.php?uid=1&muid=2&post=8842' target='translation'>translate strings in simulation to different language format</a> before download<br><a href='htmltag.php?code=users.ntnu.fkh.gravitationfnr_pkg.gravitationfnrApplet.class&name=gravitationfnr&muid=2' target='_blank'>Full screen applet</a> or <font color="#FF0000">Problem viewing java?</font><a href="http://www.java.com/en/download/help/jcp_security.xml" target="trusted">Add http://www.phy.ntnu.edu.tw/ to exception site list</a><br><b>Press the Alt key and the left mouse button to drag the applet off the browser and onto the desktop.</b> This work is licensed under a <a rel="license" href="http://creativecommons.org/licenses/by/2.5/tw/deed.en">Creative Commons Attribution 2.5 Taiwan License</a><br><a href='ntnujavazip.php?ejsuserjar=8842' title='ejs_gravitationfnr.jar' target='userjar'>Download EJS jar file</a>(1100kB):double click downloaded file to run it. (56 times by 19 users) , <a href='ntnujavazip.php?ejsuserjar=8842&type=ejs' target='userjar'>Download EJS source</a> <a href='/demolab/phpBB/ejswui.php?ejsuser=ejsuser/2/users/ntnu/fkh/gravitationfnr.ejs' target='ejsxml'>View EJS source</a><img src='images/help.gif' onClick='showejsmsg(8842)'><img src='images/plus.gif' onClick='ejsparser(8842,"gravitationfnr");'><div id='ejsmsg8842'></div>