20 Physics -- Elasticity

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Elastic behavior

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Elastic Behavior of Solids

-In solids, atoms and molecules are arranged in such a way that such molecules is acted upon by the forces due to the neighboring molecules.

- These forces are known as intermolecular forces.
- When no force is applied each molecules are in equilibrium.

- When it is slightly pulled its length increases. In other word, the solid is deformed.
- This force is deforming force and when it is removed the body gains original shape and size.
- The force responsible to bring the spring to its original state is reforming force.

Elastic Limit

- Elastic limit is the upper limit of deforming force up to which if deforming force is removed, the body regains its original form completely and beyond which if deforming force is increased, the body loses property of elasticity and gets permanently deformed.

More notes on Elasticity

Introduction of Elasticity

↪ Elasticity is a fundamental property of all matter by virtue of which an object regains its original shape and size when a deforming force is removed.↪ When the deforming force is applied to thi...

Hooke's Law

Hooke's Law↪ Elbert Hooke studied the elastic behavior of different objects.↪ He observed for relatively small deformations of an object, the size of the deformation is directly proportional to de...

Elastic Modulus

Hooke's Law (In terms of Stress and Strain)↪ Young modified the original form of Hooke's law which states that within elastic limit, stress is directly proportional to strain. That is,where E is ca...

interatomic forces and intermolecular forces

Interatomic Forces-The inter-atomic forces are electrical in nature.- Such forces are active if the distance between the atoms is of the order of atomic size (10-10 m)- An atom consists of a posi...

Stress-Strain Curve

Stress-strain Curve for Elastic Materials ↪ Suppose a metallic wire of uniform cross-section is suspended from a rigid support. ↪ If the load at the other end is gradually increased, the length goe...

Energy stored in a stretched wire

When a body is deformed, work is done by the deforming forces against the intermolecular force of attraction between the molecules of the body. This work done is stored in the body in the form of ...

Potential Energy Stored in a Stretched Wire

Potential Energy Stored in a Stretched Wire↪ Suppose a wire of length L and area of cross-section A is stretched through an extension l. ↪ Then the longitudinal strain in the wire and the tensile s...

Poisson's Ratio

Poisson's Ratio↪ If the length of a wire is increased by a force, its diameter decreases.↪ The change in length per unit original length of the wire along the direction of the force is called longi...