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Physics Part II

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Class 10 Class 12
What is strain? Define different types of strains.

Whenever a deforming force is applied on a body, the shape of the body changes. Strain is defined as the ratio of change in configuration to the original configuration.

Different types of strain are:

(i) Longitudinal strain: The deformation produced in the length of the body as a result of the deforming force is longitudnal strain. 
So, longitudinal strain is defined as the ratio of change in length (∆L) of body to its original length L.

            Longitudinal strain = ΔLL

(ii) Volumetric strain: When the deforming force produces a change in volume only then the strain produced in the body is called volumetric strain. The volumetric strain is defined as the ratio of change in volume (∆V) of the body to its original volume V.

              Volumetric strain = ΔVV

(iii) Shearing strain: When only the shape of the body deforms without any change in it's volume, it is shear strain.
So, shearing strain is defined as the ratio of the relative displacement of the opposite faces of the body to the length of the cylinder L.

                shearing strain = xL

All types of strains are dimensionless.


What do you understand by intermolecular forces?

Intermolecular force is the force between the molecules of the substance is called intermolecular force.

There is a dipole-dipole interaction between the molecules.

What is the force of adhesion?

Adhesive force is the attractive force between two unlike molecules. They are caused by forces acting between two substances like electrostatic force (attraction due to opposing charges), mechanical force etc. 

E.g., Force of attraction between gum and paper.


Define interatomic forces and give an example?

The force between atoms of the molecule is called interatomic force.

E.g.The nucleus and electron cloud of a molecule is binded by electrostatic force. 

What is the nature of inter-atomic or inter-molecular forces?

Inter-atomic or inter-molecular forces are electrostatic in nature. 


What is the force of cohesion?

Cohesive attraction or cohesive force is the force of attraction between same types of molecules sticking together.