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

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

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Engineering Mechanics
A semicircular disc rests on a horizontal surface with its top flat surface horizontal and circular portion touching down. The coefficient of friction between semi circular disc and horizontal surface is µ. This disc is to be pulled by a horizontal force applied at one edge and it always remains horizontal. When the disc is about to start moving, its top horizontal force will

Slant down towards direction of pull
Slant up towards direction of pull
None of these
Remain horizontal

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