If kinetic energy or the collisions that result from the increase in temperature, isn't a fundamental force, which of the four does it below in the category of? The force of collisions and the resultant changes it brings about to the state of the particles involved (i.e. changes of momentum) are real and observable from the largest to the smallest scales we can currently observe, so why isn't this force considered fundamental. The only difference I can see is there is no "field" associated with it, but who cares, that's not a requirement for a force to exist. Please explain how I am wrong, or whether this is just semantics and there is nothing "fundamental" about the four forces to begin with.