I was reading that the friction force involved in circular motion was in the same direction as the centripetal force; but I thought that the frictional was suppose to act in the opposite direction of the intended motion, is this not true? Also, I am having a hard time figuring out how a car could move in the first place, let alone in a circular fashion. What is the action and reaction pairs? I thought the tires pushing against the ground and the ground (friction) pushing against the tires were the force pairs? What is the external force that admits the car to move?