Question

An object is said to be in equilibrium when:
1. there is no net force acting on the object
2. the total clockwise moments about any point is equal to the total anti-clockwise moments about the same point
3. the object moves with constant velocity

• A. $1$ only
• B. $2$ only
• C. $1$ and $2$ only
• D. $1,2$ and $3$

Answer 1

The correct option is C $1$ and $2$ only

A body is said to be in equilibrium if it in translational equilibrium as well as rotational equilibrium.

For translational equilibrium, net force acting on the body must be zero i.e. $F_{net}=0$

For rotational equilibrium, net torque acting on the body must also be zero or in other words, total clockwise moments about any point is equal to the total anti-clockwise moments about the same point.