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Mechanical Properties of Solids

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Physics Part II

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Physics

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CBSE Gujarat Board Haryana Board

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Class 10 Class 12
A beam has one end fixed in a wall and loaded at the other end. Three locations A, B and C are shown in figure. Which location would you prefer to make a circular hole?



At point A, the beam undergoes tensile strain, therefore hole at A will increase in size along the length of the beam and becomes oblate. 

At point C, the beam undergoes compression strain, therefore hole at C will decrease in size along the length of beam and becomes prolate. 

The point B is in neutral zone, therefore the hole at B will be circular.

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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.
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What is the force of cohesion?

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

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

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

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