Engineering Mechanics
On a ladder resting on smooth ground and leaning against vertical wall, the force of friction will be

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

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Engineering Mechanics
According to the law of moments, if a number of coplanar forces acting on a particle are in equilibrium, then

The algebraic sum of their moments about any point is equal to the moment of their resultant force about the same point
Their lines of action are at equal distances
The algebraic sum of their moments about any point in their plane is zero
Their algebraic sum is zero

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