A force is the measure of interaction of physical bodies, that is the object of nature. The action of physical bodies on a physical point in question resulting in acceleration of the motion of this point is called a force. From now on a force may be considered a physical field which has length, motion, energy and even mass as it was discovered at the begining of the century. Forces represent a measure of mechanical interaction of bodies. The change in motion of bodies is the result of the action of forces.
Forces are the result of the action of physical bodies.
Physical bodies interact as a result of the action of forces. A force is the vector quantitative measure of the intensity of interaction. Every force is trasferred by the interchange of quantums. Force of interaction is trasferred by means of a certain mediator is called a field. There is only one force causing weak electromagnetic and strong interactions.