Among the known types of forces in nature, the gravitational force is the weakest. Why then does it play a dominant role for the motion of bodies on the terrestrial, astronomical and cosmological scale?
Nuclear forces are short-range forces and dominate only over the range of distance of the order of 10-14 m to 10-15 m.
Therefore, the motion for bodies in the terrestrial, astronomical and cosmological scale is not affected by nuclear forces.
Electric forces are both attractive as well as repulsive unlike gravitational force, and zero if the bodies are neutral. Therefore, for massive neutral bodies gravitational force plays an important role.
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