11.A system of copianar forces acting on a rigid body can be reduced to

12.Force polygon method is applicable for

13.If the given forces P,, P2, P3 and P4 are such that the force polygon does not close, then the system will

14.If two forces are in equilibrium, then the forces must i) be equal in magnitude ii) be opposite in sense iii) act along the same line The correct answer is

15.For a non-concurrent force system to be in equilibrium