Alright so I tried it out. The physics are a good start but a couple things I noticed:

- the balls take awhile to come to a stop. This of course would be a friction adjustment. You may want to evaulate some pool break shot videos on YouTube for tweaking.

- when using English downward to spin the ball back, it REALLY spins back, almost defying pysics. From what I recall, it doesn't spring back so hard and so far.

Once you're at the graphical stage let me know, I would love to adapt my aforementioned project graphics with this project if you would like