Question

Distinguish between Plastic and Elastic Materials.

Answer 1

Hint: We know that an elastic body can regain their previous shape and size after removing the force. But any plastic body only can change its shape and size while applying any force but it cannot regain its size and shape after removing that applied force.This is the main definition of elastic and plastic body respectively.

Complete answer:

Plastic Material	Elastic Material
1.If force is removed then the material gets back to their original shape	1.if force is removed then the materials they remain in the same state after withdrawing force.
2.Plastic deformation is characterized by the property Plasticity. By definition, plasticity is the property of the solid material by virtue of which it tends to retain its deformed shape even after the removal of external load.	2.In elastic deformation, atoms of the material are displaced temporarily from their original lattice site. They return back to their original position after the removal of external load.
3.Amount of plastic deformation is quite large.	3.Amount of elastic deformation is very small.
4.Force required for plastic deformation is also higher.	4.External force required for elastic deformation of solid is quite small.
5.Hooke’s Law is not applicable if the material is plastically deformed.	5.Hooke’s Law of elasticity is applicable within this elastic region.

Note:we can get confused about the examples of rubber and steel. Which is more elastic? Steel or rubber? Here the thing is which object can regain their original shape faster those are more elastic. Between rubber and steel, rubber will deform faster and wider than the steel while applying the external force but when the force is removed then the steel material will regain its original shape faster than the rubber. So the main conclusion is that steel is more elastic than the rubber.