The applet shows trajectories for 12 particles with different cases:
1. All starts at the same location, but different initial velocity
2. All starts with the same velocity, but from different location (r)
3. All starts with the same angular momentumm (r*v=constant), but from different location (r)

You can drag each moving particles to any location with mouse drag and drop.
The velocity of each particle (red arrow) can be changed,too!

/htdocs/ntnujava/ejsuser/2/users/ntnu/fkh/keplerorbit_pkg/keplerorbit.propertiesFull 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(1338.7kB):double click downloaded file to run it. (25 times by 16 users) , Download EJS source (6 times by 4 users) View EJS source