A reasonably strong force. The strongest of all the forces at short range. Intermediate in strength. Now understood to be aspect of electroweak force.
Force is only attractive.
The weakest of all the forces, by far. Physical interactions are often expressed in terms of conserved quantities, properties of matter which can be neither created nor destroyed, but can be shifted from one form to another. Momentum Momentum is defined as the mass of an object times the speed at which the object is traveling. Charge Matter can have a positive, negative, or neutral charge. Baryon number Heavy particles interacting by the strong force.