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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 cube of side 10cm made from lead is fixed at one face. When a tangential force of 334kN is applied on the opposite face, it gets displaced by 0.6mm. Find the shear modulus of lead.

Given comma space

Tangential space Force comma space straight F space equals space 334 space kN space equals space 334000 space straight N space

Side space of space the space cube comma space straight l space equals space 10 space cm space equals space 0.1 space straight m space

Area space of space the space face space over space which space the space
force space is space applied comma space straight a space equals space straight L squared space equals space 0.1 space cross times space 0.1 space equals space 10 to the power of negative 2 end exponent space straight m squared

Displacement comma space increment straight l space equals space 0.6 space mm space equals space 6 space cross times space 10 to the power of negative 4 end exponent space straight m space

Therefore comma space

Shear space modulus comma space straight eta space equals space fraction numerator FL over denominator straight a increment straight L end fraction space space

space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space equals space fraction numerator 334000 cross times 0.1 over denominator 10 to the power of negative 2 end exponent cross times 6 space cross times space 10 to the power of negative 4 end exponent end fraction space

space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space equals space 55.67 space cross times 10 to the power of 10 space straight N divided by sq. straight m

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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 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 nature of inter-atomic or inter-molecular forces?

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

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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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