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Classification of materials:


On the basis of their physical properties, the materials can be classified into following four types.


Elastic Material: When we apply some external forces on a body, it undergoes deformation. If the material regain its shape on the removal of forces, it is known as elastic material. e.g. Steel, Rubber etc. 

Plastic Material: If the material does not regain its original shape on removal of external forces then it is known as plastic material. e.g. lead

Ductile Material: The ability of a material to be drawn into wires is known as ductility of a material. e.g. gold, silver etc. 

Brittle Material: When we apply some external force on a material, it does not undergo deformation. It fails by rupture. e.g. glass

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