Strength of Materials
Two coplanar couples having equal and opposite moments

Are equivalent
Balance each other
Produce a moment of couple
Produce a couple and an unbalanced force

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Strength of Materials
Coefficient of friction is the

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

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