The strong nuclear force, aka the strong interaction.
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b. is a force of repulsion
electric force
The strong force holds the nucleus together against the repulsion between the electric charges of the protons.
a physical phenomenon produced by the motion of electric charge, resulting in attractive and repulsive forces between objects.
when you weld metal, you are combining the two masses by overcoming the electromagnetic repulsion of the electrons to each other when you bang metal together, there is not enough energy to overcome the repulsion, so the two pieces stay separate