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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
What is stress and what is its origin?

When an external force is applied on the body there is a deformation in it's shape. The deformation in the shape is due to relative change in the position of atoms or molecules. This relative change in the position causes the attractive or repulsive interatomic or intermolecular forces to set up in the solid which is called restoring force. This restoring force is the origin of stress. The restoring force per unit area is called stress.

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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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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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