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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
Two wires P and Q of same length and material but radii in the ratio 2:1 are suspended from a rigid support. Find the ratio of strain produced in the wires when: (i) both are under same stress (ii) both are loaded by same weight.

Given the radii of two wires is of the ratio 2:1.
Using the formula as per Hooke's law, 

Strain  Stress =LoadArea=Fπr2and           rP : rQ=2 : 1

i) When both the wires are under the same stress, strain produced will be the same.

ii) When both the wires are loaded by the same weight, then




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 cohesion?

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

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 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.