Elasticity (stress)

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Stress is defined as:

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In mechanics, stress ($\sigma$) is defined as the internal restoring force per unit cross-sectional area developed within a body when it is deformed by an external force. 
$	ext{Stress} = \frac{F}{A}$
- **SI Unit**: Pascal ($Pa$) or $N/m^2$.
- **Dimensions**: $[M L^{-1} T^{-2}]$, same as pressure. 
Unlike pressure, stress can be tensile, compressive, or shear, depending on the direction of the applied force relative to the area.

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Elasticity (stress)

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