Strength of Materials
The product of either force of couple with the arm of the couple is called

resulting couple
moment of the couple
resultant couple
moment of the forces

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Strength of Materials
Limiting force of friction is the

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

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