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Mechanical Properties of Solids

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CBSE Gujarat Board Haryana Board

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Class 10 Class 12
Describe the atomic theory of elasticity.

The atoms or molecules are bounded by interatomic and intermolecular forces and are in stable equilibrium whenever a perfect state is acquired. In a perfect equilibrium state, the separation is such that the net interatomic intermolecular force is zero. When a body is heated, cooled or any physical factors leads to any change in its state, the distance between the two atoms or molecules increases and attractive force comes into play. When the separation between the atoms or molecules decreases the repulsive force comes into play.
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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 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 is the nature of inter-atomic or inter-molecular forces?

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

637 Views