Applied Mechanics and Graphic Statics
On a ladder resisting on a smooth ground and leaning against a rough vertical wall, the force of friction acts

Away from the wall at its upper end
Upwards at its upper end
Towards the wall at its upper end
Downwards at its upper end

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Applied Mechanics and Graphic Statics
The necessary condition of equilibrium of a body is:

All (A), (B) and (C)
Algebraic sum of horizontal components of all the forces must be zero
Algebraic sum of vertical components of all the forces must be zero
Algebraic sum of the moments of the forces about a point must be zero

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