Question

What is stress? Give its SI units also .

Answer 1

Stres :
Force per unit area is called stress
SI unit of stress
Nm-2
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Answer 2

$\textbf{\large{Answer -}}$

On applying the deforming force on a body, a restoring force which is opposite to deforming force is developed inside the body which opposes the deforming force.

The restoring force devoloped in per unit cross sectional area of the body is known as stress.

$Stress = \frac{Restoring\:Force}{Cross-sectional\:area}$

$\boxed{Stress = \frac{F}{A}}$

In equilibrium, the restoring force becomes equal to the deforming force therefore in equilibrium, the stress can be written as

$Stress = \frac{Deforming\:Force}{Cross-sectional\:area}$

The unit of stress is $\frac{N}{{m}^{2}}$ or Pascal.

Stress is a vector quantity.

On the basis of applied deforming force, we can classify stress in two categories :

1. Normal Stress
2. Tangential Stress