Question

do you what do you mean by rigid body and non rigid body and its effect

Answer 1

usually,rigid have definite shape and proper orientation of particles. You can say they are crystalline solid. A rigid body is usually considered as a continuous distribution of mass.

in case of non rigid there is no proper arrangement of particles.you can say as amorphous solid.

a rigid body is a solid in which deformation is zero or so small it can be neglected.
Two main effects of a force on non-rigid body are: 

i) It can change the state of rest or of motion of the body.

ii) It can change the size or shape of the body. 

Answer 2

A rigid body is the one that cannot flow and whose attraction of particles is very strong.
A non rigid body is the one that can flow and whose attraction of particles is very weak.