Ok I always understood the 3rd law and normal force well until recently when I started overthinking it. In an elevator, your weight pushes down on say a scale. That scale pushes back onto you with an equal and opposite force. But if the elevator is accelerating upwards, then do you exert an even greater force on the scale and the scale in turn exerts an even greater force back on you? How does the 3rd law apply in an accelerating elevator?