Engineering Mechanics
Angle of friction is the

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

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Engineering Mechanics
The term 'Centroid' is

The point of application of the resultant of all the forces tending to cause a body to rotate about a certain axis
None of the listed here
The point of suspension
The same as centre of gravity

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