Engineering Mechanics
The static friction

Is independent of the area of contact, between the two surfaces
All of these
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

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Engineering Mechanics
The term 'Centroid' is

None of the listed here
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

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Engineering Mechanics
Which is the correct statement about law of polygon of forces?

If a polygon representing forces acting at a point is closed then forces are in equilibrium
If any number of forces acting at a point can be represented in direction and magnitude by the sides of a polygon taken in order, then the forces are in equilibrium
If any number of forces acting at a point can be represented by the sides of a polygon taken in order, then the forces are in equilibrium
If any number of forces acting at a point can be represented in direction and magnitude by the sides of a polygon, then the forces are in equilibrium

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