Question

The conditions for equilibrium of a system of parallel forces acting in a plane is/are

• A. algebraic sum of all forces must not be zero.
• B. algebraic sum of moments must be zero.
• C. algebraic sum of all forces must be zero.
• D. algebraic sum of moments must not be zero.

Answer 1

Answer: (B), (C)

The correct options are
B

algebraic sum of moments must be zero.

C

algebraic sum of all forces must be zero.

For a system of two parallel forces, the conditions of equilibrium are :

1)Algebraic sum of all forces must be zero,

2)Algebraic sum of moments due to all forces about any point must be zero.