Engineering Mechanics
Angle of friction is the

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

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Engineering Mechanics
The term 'Centroid' is

The point of suspension
The same as centre of gravity
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

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Engineering Mechanics
For any system of coplanar forces, the condition of equilibrium is that the

Algebraic sum of the vertical components of all the forces should be zero
All of these
Algebraic sum of the horizontal components of all the forces should be zero
Algebraic sum of moments of all the forces about any point should be zero

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