Strength of Materials
Two coplanar couples having equal and opposite moments

Balance each other
Produce a moment of couple
Are equivalent
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 in motion
the friction force acting when the body is just about to move
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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