Question

What condition or conditions are necessary for static equilibrium?

∑F = 0

∑ torque = 0

Both (a) and (b)

Neither (a) nor (b) ?

Answer 1

What condition or conditions are necessary for static equilibrium

∑F = 0 & ∑ torque = 0 so  

answer = Both (a) and (b)

The word equilibrium means balance. In particular, static equilibrium means that a system is stable and at rest. This means that the net force must be zero – called translational equilibrium. However, to be complete the net torque must also be zero – called rotational equilibrium. For complete static equilibrium, both of these two conditions must be fulfilled.