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

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

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Engineering Mechanics
Coplanar concurrent forces are those forces which

Meet at one point and their lines of action also lie on the same plane
Do not meet at one point, but their lines of action lie on the same plane
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

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