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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

The stress-strain graphs for materials A and B are as shown in figure. Which of the material:

(i) has greater value of Young's modulus, 

(ii) is more ductile or more brittle? 


(i) For graph A, slope of OE is more than that of graph B. Therefore, Young's modulus of material A is greater than that of B.

(ii) Material A shows wider plastic region than that of B. Thus, A is ductile than B and B is more brittle than A. 


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.


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.