You can drag the satellite and simulate different trajectory.
You can also check the [b]show velocity[/b]  to change the velocity,too!

I just modify the satellite image (set draggable to true)!

This simulation can be used to illustrate kepler's 2nd law,too.
The # of trace points is the same (mean the same time interval), howevwr, the angle spread out is different.
It move much faster when it is closer to the earth, it move slower when it is far away from the earth.
However, the area is the same (from center of the earth, to both end of the trace)

translate strings in simulation to different language format before download
Full screen applet or Problem viewing java?Add http://www.phy.ntnu.edu.tw/ to exception site list
Press the Alt key and the left mouse button to drag the applet off the browser and onto the desktop. This work is licensed under a Creative Commons Attribution 2.5 Taiwan License
Download EJS jar file(3100.9kB):double click downloaded file to run it. (4 times by 3 users) , Download EJS source View EJS source