Question

what do we mean by rigid body and non rigid body?

Answer 1

Rigid body: a body whose size and shape cannot be changed,however large the applied force may be is called rigid body.
Non rigid body: a body whose size and dimensions changes with respect to the applied force is called non rigid body.

Answer 2

Explanation:

A body whose constituent particles remain at their respective positions relative to one another when a body is in translational of rotational motion is called a rigid body .