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Mechanical Properties of Solids

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Physics Part II

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Class 10 Class 12

A steel wire of length 4.7 m and cross-sectional area 3.0 × 10-5 m2 stretches by the same amount as a copper wire of length 3.5 m and cross-sectional area of 4.0 × 10–5 m2 under a given load. What is the ratio of the Young’s modulus of steel to that of copper?

Length of steel wire, L= 4.7m
Length of copper wire, Lc=3.5m
Area of cross-section of steel wire, As=3.0 x 10-5 m2
Area of copper wire, A= 4.0 x 10-5 m

To find = the ratio of Young's modulus of steel to that of copper?

ΔLs=ΔLc  and  Fs=FcYoung's modulus is given by, Y=FALΔL          YsYc=FsAsLsΔLsAcFcΔLcLc                   = LsLcAcAs                   =4.7×4.0×10-53.5×3.0×10-5                   =1.8


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. 

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

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


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.