Engineering Mechanics
The algebraic sum of moments of the forces forming couple about any point in their plane is

Constant
Both of above are wrong
Equal to the moment of the couple
Both of above are correct

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Engineering Mechanics
The static friction

Is independent of the area of contact, between the two surfaces
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
All of these

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