Two smooth blocks are placed at a smooth corner as shown. Both the blocks are having mass m. We apply a horizontal force F on the small block m. Block A presses the block B in the normal direction, due to which pressing force on vertical wall will increase, and pressing force on the horizontal wall due to block B decreases, as we increase F. As soon as the pressing force on the horizontal wall by block B becomes zero, it will loose the contact with the ground. If the value of F is further increased, the block B will accelerate in upward direction and simultaneously the block A will move toward right. ($\theta ={37}^0$  with horizontal)