What is Rigidity in Physics?

In physics, "rigid" refers to an object that does not change shape or deform when a force is applied to it. In other words, a rigid object maintains its original shape and size even under external forces.

For example, a metal rod is considered rigid if it does not bend or deform when a force is applied to it. Similarly, a rigid body in motion will maintain its shape and size as it moves through space, whereas a flexible or deformable object may change shape or size in response to external forces.

In engineering and materials science, the term "rigidity" is often used to describe the ability of a material to resist deformation under load. Materials with high rigidity are those that do not deform easily, while those with low rigidity are more prone to deformation.

In summary, rigid refers to an object or material that maintains its original shape and size even under external forces, and rigidity is the ability of a material to resist deformation under load.