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

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

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Strength of Materials
Center of percussion is

the point of C.G.
the point of application of the resultant of all the forces tending to cause a body to rotate about a certain axis
point of suspension
the point of metacentre

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Strength of Materials
Coefficient of friction is the

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
the friction force acting when the body is in motion

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