What is the SI unit of stress?

Correct option is B

The correct answer is (B) Pascal

Explanation:
Stress is defined as the restoring force per unit area developed inside a body when it is subjected to a deforming force.

The mathematical formula for stress is:
Stress = Force (F) / Area (A)

The SI unit of Force is the Newton (N) and the SI unit of Area is square metre (m²).
Therefore, the SI unit of stress is N/m², which is defined as the Pascal (Pa).

Stress is a measure of the internal resistance offered by a body against deformation.

Information Booster:
Pressure and Stress share the same SI unit (Pascal), but they are physically different:

• Pressure is an external force per unit area.

• Stress is an internal resistance developed within a material.

There are three main types of stress:

1. Tensile/Compressive stress (longitudinal)

2. Shearing stress (tangential)

3. Hydraulic stress (bulk)

Additional Knowledge:

Joule (Option A)
The Joule (J) is the SI unit of Work and Energy.
It is defined as the work done when a force of one Newton displaces an object by one metre.

Volt (Option C)
The Volt (V) is the SI unit of Electric Potential and Electromotive Force (EMF).
It represents the potential difference required to carry one ampere of current through a resistance of one ohm.

Watt (Option D)
The Watt (W) is the SI unit of Power.
It is defined as the rate of doing work or consuming energy at one Joule per second (1 W = 1 J/s).