You might get a more sophisticated answer in the fyzics section, but as far as I know, the "strong nuclear force" acts at 10^-15*m ranges, i.e. nuclear ranges, and is approx. one hundred times as strong as the electromagnetic force that acts repulsively between positively charged nuclear particles.
The "weak interaction" is a little bit more abstruse, and I have told a couple of physicists of my acquaintance that they were having me on when they tried to explain it me. (They were too, I still don't believe them). The [wiki article is here.](https://en.wikipedia.org/wiki/Weak_interaction)
Would one of the mods please move this question to the physics section?