Devlog 3: Strong force

I have now implemented a strong force, I did that by using the Cornell potential and it’s derivative:

V(r) = -(a/r) + ro
F(r) = -(a/r^2) - o        (Derivative!)

It took me a bit to both find that formula, and to try understand it, but now I think I understand it good enough.
But I do think I have to change some stuff, because the neutrons and protons like do not stop at all, and I think the electrons shouldn’t be affected the way they are, but I think the reason for both might be that the derivative is bad? I don’t really know, I don’t know how derivatives work.