Applied Mechanics and Graphic Statics
If a body is lying on a plane whose inclination with the horizontal is less than the angle of friction, then i. a force is required to move the body upwards ii. a force is required to move the body downward iii. the body will not be in equilibrium The correct answer is

only (ii)
only (i)
both (i) and (iii)
both (i) and (ii)

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Applied Mechanics and Graphic Statics
The necessary condition of equilibrium of a body is:

Algebraic sum of horizontal components of all the forces must be zero
All (A), (B) and (C)
Algebraic sum of the moments of the forces about a point must be zero
Algebraic sum of vertical components of all the forces must be zero

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