Question

The necessary condition for equilibrium of a body is

• A. algebraic sum of all forces and moments of forces must be zero.
• B. algebraic sum of all the forces must be zero
• C. algebraic sum of all the moments of force must be zero
• D. None of the above

Answer 1

The correct option is A algebraic sum of all forces and moments of forces must be zero.

For translational equilibrium, the algebraic sum of all forces must be zero and for rotational equilibrium, the algebraic sum of all moments of force must be zero.

So, for equilibrium of a body algebraic sum of all forces and moments of forces must be zero.