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

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

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Engineering Mechanics
The static friction

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

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