Now through my understanding, there is a weight force that points downward on block A, also another weight force that points downward on block B.
Between block A and block B, there is two normal forces equal in magnitude and opposite in direction right? (contact force). I believe the reason is because of electrostatic thingy between the two surfaces.
Then, isn't there two normal forces equal in magnitude and opposite in direction as well between block A and the surface? Since they're in contact of each other as well?
The left diagram is what I think the free-body diagram is. The right one is what I usually see. Which one is correct?