http://www.physicsclassroom.com/Class/sound/u11l2c.cfmElastic properties are those properties related to the tendency of a material to maintain its shape and not deformcordint whenever a force or stress is applied to it. A material such as steel will experience a very small deformation of shape (and dimension) when a stress is applied to it. Steel is a rigid material with a high elasticity. On the other hand, a material such as a rubber band is highly flexible; when a force is applied to stretch the rubber band, it deforms or changes its shape readily. A small stress on the rubber band causes a large deformation. Steel is considered to be a stiff or rigid material, whereas a rubber band is considered a flexible material
according to this,rubber is not elastic
The problem is that I read before that elasticity is the physical property of the material when it deforms under stress(eg external forces),but it returns to its shape when the stress is removed.
An object is said to be elastic if it restores its original size and shape.
but rubber is elastic because it restores its original size and shape..
I fell that this is contradicory
Is elasticity constant for all solids?
its written in the text book that "the speed of sound increases in solids and liquids by increasing their densities due to the increase in their elasticities"
is that true? If so ,Is there a relation between elasiticity and density?