Body and its types

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What is Body?
Body is a matter that is bounded by a closed surface.

What are types of body?
Rigid body
Flexible body (or) Elastic body

What is Rigid Body?
I explain this with an example. Consider mobile phone. Now you choose any two points on your phone. Now you shake your phone. Does the distance between the assumed two points changed? It doesn’t.

That means for a rigid body distance between its points or particles is held constant even though if they undergo any deformation. Practically the distance between particles will be changed. For a rigid body the value of deformation is negligible.

What is Elastic body?
For an elastic body, distance between the particles changes with respect to forces that it is subjected. 

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