Engineering Mechanics
The term 'Centroid' is

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
The point of suspension
None of the listed here

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Engineering Mechanics
The static friction

Always acts in a direction, opposite to that in which the body tends to move
Bears a constant ratio to the normal reaction between the two surfaces
All of these
Is independent of the area of contact, between the two surfaces

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