What is an essential characteristic of an object in equilibrium

The essential characteristics of an object in equilibrium is acceleration of the object must be zero.

Explanation:

Equilibrium: An object acted upon by several forces is said to be in equilibrium if it does no it moves or rotate. Equilibrium can be defined as the state of stability of an object.

Condition for equilibrium

(i) The resultant force acting on the object must me equal to zero.

(ii) The sum of moment acting on the object must be equal to zero.

But.

F = ma ... Equation 1

Where F = net force, m = mass, a = acceleration.

from the equation above,

For F = 0 N, a must be equal to zero.

From the above, the essential characteristics of an object in equilibrium is acceleration must be zero