Equilibrium of Rigid Body, Definition and Explanation

Equilibrium of Rigid Body: In the vast field of engineering mechanics, one fundamental concept that holds utmost importance is the equilibrium of rigid bodies. Understanding the principles of equilibrium is crucial for engineers, as it forms the foundation for analyzing and designing various mechanical structures, ranging from bridges and buildings to machines and vehicles.

Definition of Equilibrium

• “ When a body is subjected to forces and the body is either at rest or moving with constant velocity in the same direction, the body is said to be in equilibrium. "

• For a rigid body to be in equilibrium, the necessary conditions are

• For a coplanar force system, the necessary conditions of equilibrium are

• In simple words, “Equilibrium occurs when both the resultant force and the resultant couple on a body are zero."

Conditions of Equilibrium for Various Types of Coplanar Force Systems:

• Coplanar Collinear Force System :

• Coplanar Concurrent Force System:

• Coplanar Parallel Force System:

• Coplanar Non-Parallel Non- Concurrent Force System: