Chapter Chosen

Mechanical Properties of Solids

Book Chosen

Physics Part II

Subject Chosen


Book Store

Download books and chapters from book store.
Currently only available for.
CBSE Gujarat Board Haryana Board

Previous Year Papers

Download the PDF Question Papers Free for off line practice and view the Solutions online.
Currently only available for.
Class 10 Class 12
When a wire is loaded by weight M1, its length is Land when loaded by weight Mits length becomes L2. Find the original length of the wire. 

L1 wire is loaded by weight Mand when M2 is loaded length becomes M2

Let L be the original length, A be the area of cross section of wire and Y be Young's modulus of the material of wire.
Therefore, the extension in wire is (L
1–L) when loaded by weight M1 and that is (L– L) when loaded by weight M2.

Thus, Young's modulus is,

Y = M1g×LA(L1 - L)= M2g×LA(L2 - L)        M1(L1-L) = M2(L2 - L) M1L2 - M1L1 = M2L1 -M1L2                      L = M2L1 - M1L2(M2-M1)


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. 

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.


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.