Engineering Mechanics
Three forces acting on a rigid body are represented in magnitude, direction and line of action by the three sides of a triangle taken in order. The forces are equivalent to a couple whose moment is equal to

Area of the triangle
Half the area of the triangle
Twice the area of the triangle
None of these

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Engineering Mechanics
Angle of friction is the

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

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