Question

How does static equilibrium work in the body?

Answer 1

A body is said to be in equilibrium when it is at rest or it is performing uniform motion. We can consider an inertial frame as a reference point which does not have translational motion and rotational motion, then the body in that reference frame is considered to be in static equilibrium. At static equilibrium the total external forces acting on a body is equal to zero and the external torque is also zero.

Complete solution:
In this question the word 'static' means stable or stationary. Thus, static equilibrium can be attained by any object when it is at rest from a reference point. The total forces which are acting on a body should be considered when the body is at rest.

A body is said to be in static equilibrium when the vector sum of all the external forces acting on a body results out to be zero.

According to Newton ‘s law of motion, a body that is in rest continues to be in rest and a body which is in motion always continues in motion unless and until some external force acts on it. For example, we can take a book which is at rest on a table, it will be in static equilibrium unless and until somebody moves it.

Additional information:
There are two types of equilibrium: (1) Static equilibrium, (2) Dynamic equilibrium. Static equilibrium represents when the body is at rest, and the dynamic equilibrium represents when the body is in motion, that is the body has uniform velocity.

Note:
The word ‘static’ means stable or stationary. Thus, whenever a body is at rest means not in motion it is said to be in static equilibrium. Equilibrium means a body is at rest or it is uniform motion. For this we need to consider an inertial frame of reference which does not have rotational motion and translational motion, then the body is said to be in static equilibrium. At static equilibrium the total external forces acting on a body is equal to zero and the external torque also must be zero, while in dynamic equilibrium the external force and the external torque is not equal to zero.