I don't get it, you are still applying the force in the same direction. I mean if you rotate the 'wrong' picture by 90 degrees you will see that they are both the same thing
In the "Right" photo, the glue is at the top of the image. In the "Wrong" photo, it is at the top of the image too. The wrong movement detaches the glue from the center of the pad to the edge. The right one detaches it from the right side to the left side of the glue bar. Both directions are orthogonal.
Re: On the Proper Use of Post-Its
#41same, thanks!