For the sake of the questions, I am going to ask them in regards to the gravity of the earth. When gravity pulls down on a certain body, and that body interacts with the ground, a third law force pair is made and the body pushes down on the earth with the same force that gravity pulled it down. Now, the normal force is another third law force pair, and it pushes back up on the object with the same force that the object pushed down on the ground. Thus causing equilibrium. Is this all correct? If it is, then I have some questions: If gravity pulls down on an object, and an object pushes down on the ground, then is this an exception to Newton's Third Law? Why aren't the forces opposite? Is this true of any "pulling force?" If there are only three forces coming into play in gravity, then is the reaction (a reaction because it reacted to gravity) of the body pressing down on the ground, also an initial action at the same time by causing the reaction of the normal force? Is the one force of the body pressing into the ground both a reaction and an action at the same time in both separate third law force pairs? So actions and reactions are not mutually exclusive? Thanks in advance to anyone.