# Force diagram - Circular motion [closed]

If the bike is maintaining a horizontal trajectory, what are the forces on it? The solution o this shows weight and a force labelled N at the angle a to the wall. I don't understand that because if N is the normal contact force, it should be perpendicular to the wall. Any help would be appreciated

In this case they are just using the variable $$N$$ to represent the total contact force with the wall. The total contact force is, in general, not perpendicular to the wall.