Nootan Solutions Elasticity ISC Class-11 Physics Nageen Prakashan Chapter-13 Numericals of latest edition. Step by step Solutions of Kumar and Mittal ISC Physics Part-2 Class-11 Nageen Prakashan Numericals Questions. Visit official Website CISCE for detail information about ISC Board Class-11 Physics.

## Nootan Solutions Elasticity ISC Class-11 Physics Nageen Prakashan

 Class: 11 Subject: Physics Part-2 Chapter 13             (Elasticity)
 Board ISC Writer / Publications Nootan / Nageen Prakashan / Kumar and Mittal Topics Solved Numericals of page 576, 577

### Nootan Solutions Elasticity ISC Class-11 Physics Nageen Prakashan

#### What is Elasticity?

When an external force is applied to a rigid body there is a change in its length, volume (or) shape. When external forces are removed the body tends to regain its original shape and size. Such a property of a body by virtue of which a body tends to regain its original shape (or) size when external forces are removed is called elasticity.

Stress and Strain

#### What is Stress?

Elastic bodies regain their original shape due to internal restoring forces. This internal restoring force, acting per unit area of the deformed body is called stress.

#### Types of Stress

There are three types of stress

• Longitudinal stress
• Volume stress
• Tangential stress (or) shear stress

#### Longitudinal Stress

When the stress is normal to the surface area of the body it is known as longitudinal stress.

Again it is classified into two types

• Tensile stress
• Compressive stress.

Tensile stress: When longitudinal stress produced due to an increase in the length of the object is known as tensile stress.

Compressive stress: Longitudinal stress produced due to the decrease in length of the object is known as compressive stress.

#### Volume Stress

If equal normal forces are applied every one surface of a body then change in volume produced. The force opposing this change in volume per unit area is called volume stress.

#### Tangential Stress

When the stress is tangential (or) parallel to the surface of the body is known as Tangential (or) Shear stress. Due to this shape of body changes (or) gets twisted.

#### What is Strain?

The ratio of charge of any dimension to its original dimension is called strain.

Strain also classified into three types

• Longitudinal strain
• Volume strain
• Shearing strain

### Stress Strain Graph

1. Proportion limit: The limit in which Hook’s law is valid and stress is directly proportional to strain.
2. Elastic limit: That maximum stress which on removing the deforming force makes the body to recover completely its original state.
3. Yield point: The point beyond the elastic limit at which the length of the wire starts increasing with increasing stress. Is defined as the yield point.
4. Breaking point: The point when the strain becomes so large that the wire breaks down, at last, is called the breaking point.

#### Elastic hysteresis

The strain persists even when the stress is removed. This lagging behind of strain is called elastic hysteresis. This is why the values of strain for the same stress are different while increasing the load and while decreasing the load.

#### Hooke’s Law

If deformation is small, the stress in a body is proportional to the corresponding strain this fact is known as Hooke’s law.

### Chapter-13 Elasticity

ISC Physics Class-11 Nootan Solutions Nageen Prakashan Numericals of Kumar and Mittal

Page No 576, 577

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