The moment about the Cantilever beam

[hjkklm]

From the picture,
Why do this diagram have the force of H? The wall which exert the force of H to the beam?

V=W that have been known from the questions.
When V=W, what else of other forces to balance the forces of G and H?

Besides, the moment should been clockwise moment, then the counterclockwise in the picture that is occurred by which forces and distance?


thank you very much!

 

[LawrenceC]

The forces at the wall generally denote how the wall reacts to the loaded beam. Therefore only V and the moment would appear.