If you are looking for a simple classical style equation describing the force to be proportional to a specific power of distance, there isn't any. The strong nuclear force is characterized by. read more
The strong force between quarks actually increases with distance, roughly the nucleon size. Then it stays about constant, independent on the distance (!) The nuclear force (between nucleons) is rather complicated, at very small distances it is repulsive, beyond distances of about a fermi it drops off exponentially. read more
The strong nuclear force is one of the four fundamental forces in nature; the other three are gravity, electromagnetism and the weak force. As its name implies, the strong force is the strongest force of the four. read more