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

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

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Strength of Materials
Kinetic friction is the

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

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