Particle Physics (6 of 41) The Nuclear Strong Force

In this video I will explain the nuclear strong force.

Next video in the Particle Physics series can be seen at:

[TheDudeKicker]

Finally!! a video that explains the strong force without all the extra "fluff" that gets in the way of understanding the core concepts. Thank you for do this and not getting caught up in trying to entertain me like a 5 year old.

[genebaykara]

Thank you for all your videos. I will be watching all of them as I am
addicted to Physic . I am also experienced enough to  know a good teacher when
I see one. I like your style.Having said that, I couldn’t help notice that you never mentioned repulsive nature of strong force  when quarks are too close nor the color charge . I am sure you know without repulsive nature of strong force, matter could not be stable . Even it was, then  there  could be no neutron star and no life ? Color  charge could have explained young guys like the one below why we need neutrons. I am sure you have your reasons . Thanks.

[wildmindentertainment]

gr8! Finally found what I was searching to understand :D great job

[scottdc]

I pre-googled this scenario and i want to confirm it, in regards to the strong force it works in reverse for quarks/gluons verses protons/neutrons in respect to distance. In quarks/gluons it gets stronger with distance and with protons/neutrons it gets weaker with distance. Essentially keeping quarks and gluons tightly bound together and protons and neutrons from being too close together. (with the later electromagnetism holds the nucleus together as well as holding the electrons and nucleus together). Is that a fair statement?

[JoeDeglman]

How do we know that the strong force is an electrical force?  Maybe the nucleus is just a crystalline structure that is held together because it was "melted and recrystallized" when reformed in a star?

[zakirhussain-jsku]

What hold electron together. Gravity will be too weak. Electric field can't generate a force in the absence of an other charge. Magnetic field has opposite poles which could generate an attractive force. Does magnetic field of electron prevents it from disintegrating?

[jmfrank]

Your series is extremely well done, thank you.
Especially you coverage of the photon. I would like to see some extra videos for the strong force and QCD for there are two things I do not understand:

First: If the strong force is a spill out force, like you explained, why do we need the neutron? Just protons would work as well.

Second: From my mechanical knowledge, if something is stable the force between the two objects is exactly zero (the sum of all forces). So If a nucleus growth, there is no "extra saved" force acting, for the repulsion of the inner protons has already been counteracted by the strong force of the inner protons. So in theory, with a spill out force, a nucleus could grow to almost infinity, without ever getting unstable. It is as well not explained why there are small unstable nuclei and bigger stable ones.
I really would like to have a more detailed explanation.

Thank you

[zakirhussain-jsku]

I think during formation, atom loses some energy which results in lower energy density in the atom. Lower energy density induces strong attractive force b/w protons. Higher energy density in heavier atoms induces repulsive force which splits such atom.

[parable]

I believe the force holding the quarks together are gluons

[simamkhan]

Sir how we mathematical prove that ratio between strong nuclear force and coulomb repulsive force=100

[daltonstanley]

Hi, I hope you don't mind me asking a late question.. Is the spill over of nuclear strong force more interaction between quarks of different subatomic particles?

[brankozivlak]

At the table you wrote: "Beleved that the force that keeps the nucleons together is the residual force between the quarks. I'm sure there's no attraction or repulsion on the surface of the neutron. For the force the only essential things are mass and the radius from the center of mass. There is no residual force.

[jakubkusmierczak]

Mr. Professor does somebody try to bring them together? not separate