A. Action and reaction are equal and opp B. If a body is in equilibrium under the action of a number of parallel forces, sum of clockwise moment equals sum of anticlockwise moment C. If a body is in equilibrium under the action of a number of parallel forces, sum of clockwise moment about a point equals sum of anticlockwise moment about the same point. D. If a body is in equilibrium under the action of a number of parallel forces, all forces cancel out
