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

Downwards at its upper end
Zero at its upper end
Upwards at its upper end
Perpendicular to the wall at its upper end

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Engineering Mechanics
Non-coplanar non-concurrent forces are those forces which

None of these
Do not meet at one point and their lines of action do not lie on the same plane
Meet at one point, but their lines of action do not lie on the same plane
Do not meet at one point but their lines of action lie on the same plane

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