Well, look at it this way:Two of the same kind of charges repel each other, right ?Now, how about two protons in the nucleus of an atom ? The charge on each protonis 1.6 x 10-19 coulomb, and they're about 4 x 10-15 meter apart. It's easy to calculatethe strength of the force pushing them apart. It's about 3.1 pounds ! ! ! Trying to pushtwo little particles apart that each weigh about 0.0000000000000000000000000589 ounce !But the nucleus of every atom in the universe does not fly apart.That's the role of the strong nuclear force.