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    Mechanical Properties of Solids
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    What is ‘elastic after effect’? 
    When deforming forces are removed, the body takes time to come back to its original state. The delay in coming back to it's original state is called 'elastic after effect'. 
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    Name two factors that change the elastic properties of a body.
    Two factors that change the elastic properties of a body are:
    1. Change in temperature, and
    2. Presence of impurities 
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    It is easy to break the wire by bending repeatedly in opposite direction instead of breaking it by stretching directly. Why?
    It is easy to break the wire by bending repeatedly in opposite directioninstead of breaking it by stretching directly because by applying alternate force on the wire, the wire loses its strength and hence it is easy to break.
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    What is elastomer?

    The elastic substances that can be subjected to large strain without breaking are called elastomers. 
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    What is the relation between deforming force and restoring force at equilibrium?
    When in stable equilibrium both these forces, deforming force and restoring force are equal and opposite.
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