## Chapter Chosen

Mechanical Properties of Solids

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CBSE Gujarat Board Haryana Board

## Previous Year Papers

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Class 10 Class 12
One meter long elastic wire is fixed at one end and at the other end a weight of 3kg is attached. The mass is pulled away from vertical line (passing through point of suspension) to a distance 0.6m and made to revolve with horizontal circle of radius 0-6m. Find the increase in length of the wire. Given that area of cross-section of wire 2x10–7m2 and Young's modulus of material of wire 2.5x1010 N/m2.

The given question is illustrated in the figure. below.

From right angled ,

The different forces acting on mass are:

(i) Weight mg in vertically downward direction.

(ii) Tension T in the string along AS.

Now resolving the components of T as shown in fig. above.

The component Tcosθ balances the weight mg of the mass and component Tsinθ provides the necessary centripetal force to whirl the mass.

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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 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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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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