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

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

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Applied Mechanics and Graphic Statics
Kinetic friction may be defined as

Angle between normal reaction and resultant of normal reaction and limiting friction
Friction force acting when the body is just about to move
Ratio of limiting friction and normal reaction
Friction force acting when the body is in motion

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