Explain Hooke's Law.

(N/A) Hooke's Law states that for small deformations,the stress and strain are proportional to each other.
$\text{stress} \propto \text{strain}$
$\therefore \text{stress} = k \times \text{strain}$
Here,$k$ is the proportionality constant,known as the modulus of elasticity.
Hooke's law is an empirical law and is valid for most materials within their elastic limit.
However,some materials do not exhibit this linear relationship.
The $SI$ unit of $k$ is $N \ m^{-2}$ or $Pa$. The dimensional formula is $[M^1 L^{-1} T^{-2}]$.