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6.1 Definition of Elasticity

When externally applied forces are balanced, no net force will act on the object and hence no translational motion can be produced. However, deformation in shape or/and size can occur depending on the intermolecular forces with which the molecules or atoms of the subject hold each other. In such a case the objects can be classified as follows :

Rigid Objects

If no deformation occurs whatsoever, then the object is called a Rigid Object.

Elastic Objects

Deformation does occur, but it disappears if the balanced external forces are removed.

Plastic Objects

Here, deformation does occur, and it remains permanent even if the balanced external forces are removed.

From the above classification the elastic property can be defined as :

If the object is capable of resisting deformation and is capable of overcoming deformation and regaining its original shape and size when externally applied balanced forces are removed then the object possesses the property called elasticity.

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6.1 Definition of Elasticity
6.2 Types Of Deformations
6.3 Deforming and Restoring Forces
6.4 Strain and Stress
6.5 Hooke's Law
6.6 Elastic Modules
6.7 Strain Energy

Chapter 7

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