Request: looping with energy and normal force

For educational use I am looking for an applet like [url=http://www.phy.ntnu.edu.tw/ntnujava/index.php?topic=693.0]http://www.phy.ntnu.edu.tw/ntnujava/index.php?topic=693.0[/url]  Pity, I can see only the snapshot. The applet self stays black.

In the request applet I would like to see Gravity force, Normal force and centripetal force, changing during the motion in for example a perfect circular looping of a coaster.

Switch on/off the influence of energy: speed in relation to height. If speed gets to low mass leaves circular motion for a time to perform a ballistic curve.

Displayed  bars for actual kinetic and potential energy

Changes user can make: changes in mass, speed .
Radius may stay constant.

I searched Internet for it but did nothing find.

Who is willing to spent time to program this?

Thanks