What Are the Physics Equations Behind Zero-G Rolls in Roller Coasters?

[physicsCU]

Hey,

Can anyone show me a site that talks about the physics equations involved in the zero-g rolls of a roller coaster?

I know they are called heartline spins and resemble a barrel roll, but I need help with the physics equations.

Thanks!

 

[andrewchang]

see if these link to anything:

http://www.Newton.dep.anl.gov/app/links.htm

http://www.Newton.dep.anl.gov/app/nau_links.htm