What force potential should I use for star formations?

[sqljunkey]

I'm running some molecular dynamic simulations and I came across this, https://en.wikipedia.org/wiki/Star_formation#Cloud_collapse , and I was wondering if there was a specific force potential to use in this case.

Supposing I have a ensemble of heated atoms moving around and I cool them down how and when will gravity start playing a role.

 

[TeethWhitener]

The force of gravity is so weak that any remotely realistic molecular dynamics simulation will never show you the effect from gravity. You can get a rough order of magnitude estimate for how weak gravity is by calculating the gravitational escape velocity for a molecular mass and use kinetic theory to find out roughly what temperature that velocity corresponds to.