Strength of Materials
Two coplanar couples having equal and opposite moments

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

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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
angle between normal reaction and the resultant of normal reaction and the limiting friction
ratio of limiting friction and normal reaction

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