Differentiate between stress and strain?
Difficulty: Medium
Stress:
The force acting on a unit area at the surface of a body is called stress.
Thus stress = $\frac{Force}{Area}$
Unit: In SI, the unit of stress is newton per square meter $(Nm^{-2})$.
Strain:
A comparison of such a change caused by the stress with the original length, volume, or shape is called strain.
If stress produces a change in the length of an object then the strain is called tensile strain.
Tensile strain = $\frac{(Change in length)}{(Original length)}$
The strain has no units as it is simply a ratio between two similar quantities.
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