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Mechanical Properties of Solids

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Physics Part II

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CBSE Gujarat Board Haryana Board

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Class 10 Class 12
A load W is hanging from the string of length l and area of cross section A. The string suddenly breaks. Find the change in the temperature of the string. Take heat capacity of string as Q and Young’s modulus as Y.

Length of the string =l
Heat capacity of the string = Q
Young's modulus = Y

The potential energy stored in the loaded string is,

                 U=12×stress×strain×volume   = 12(Stress)2YxVolume   =12W2A2YA   =12W2AY

When the string breaks, the potential energy stored in the string is converted into heat.

Let θ be the rise in temperature.

         =12W2AY      θ=12W2QAY 
is the required change in temperature of the string. 

What is the force of cohesion?

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

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

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


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.

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 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.