I am currently thinking about nuclear fission and realized that I forgot some basic facts I've learned (and understood... at least I thought so) some years ago in school.
I know that electrons are negatively charged, neutrons are neutral and protons are positively charged. I know that same charged particles repels and different charged particles attract each other. Electrons don't fall in the nucleus, because they are flying around it too fast (at least that is a somewhat reasonable way to think about it - I realize that the details are much more complicated). The nucleus is stable, because besides the electric force there is gravity (which was not so important in that context, if I remember it correctly) and the two nuclear forces. Those make sure that the nucleus is stable.
However, what do neutrons change in this context? Are they behaving similar as protons when it comes to the nuclear forces?
Now, what happens when a neutron hits a 238U?