Conservation of energy

http://inspire.eun.org/index.php/P4-5-4
http://www.surendranath.org/Applets/Dynamics/Coaster/CoasterApplet.html
Overview:

This simulation allows us to experiment with mechanical energy conservation.

You may modify:

* The initial height
* The height of the barrier
* The loop radius

You may also show the position of the cart at equal time intervals.