There is a table besides a wall (so that one edge of the table is touching the wall). Both wall and table have frictionless surfaces. Say I place a block on the table so that it's touching the wall. Drawing a free-body diagram depicting the situation gives me three forces: the normal to the table and the weight of the block which cancel out, and the normal to the wall. If the block is in equilibrium then the normal force to the wall is zero. Somehow this is bothering me. Now if the table had a rough surface, then I could say that the normal to the wall and static friction cancel each other out. But if there is no static friction, what happens? Can anybody clarify on this please?