Question

What do you mean by elastic bodies and plastic?

Answer 1

Plastic deformation is almost permanent whereas elastic deformation can be altered.
Plastic deformation is undesirable.

Complete step by step answer: The property by virtue of which a body doesn't recover its unique size and shape on expulsion of applied power is called a plastic body. The property because of which a body recovers its unique size and shape on expulsion of outer twisting power is called elastic.

At the point when energy goes into changing the state of some material and it remains changed, that is supposed to be plastic deformation. At the point when the material returns to its unique structure, that is elastic deformation. Mechanical energy is lost at whatever point an item goes through plastic deformation.
In elasticity the deforming power required is little. Within the elastic cut-off the Hooke's law is pertinent. As solids have unequivocal shape and volume they additionally have versatility of shape and volume. Fluids have a distinct volume yet an inconclusive shape. Thus, they have volume flexibility. Gases likewise have volume flexibility.
Elastic bodies have restoring or elastic forces. The internal forces restore the elastic bodies to their original shape.
Plastic bodies cannot regain their original shape and size. In plasticity the deforming power required is more. A body which can be easily deformed and cannot revert back to their original shape is a perfectly plastic body. Hooke’s law is not applicable here.

Note: The plastic bodies are formed after they have lost their elasticity. A perfectly deformed plastic body does not exist since almost all things can be moulded somehow.