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

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

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Engineering Mechanics
The static friction

Is independent of the area of contact, between the two surfaces
Always acts in a direction, opposite to that in which the body tends to move
All of these
Bears a constant ratio to the normal reaction between the two surfaces

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