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What is the Difference between Stress and Strain in Physics

Difference between Stress & Strain

 

When a body is made to change its length, volume or shape by the application of an external force, the opposing force per unit area is called Stress.

 

 

Formula:

 

Stress = Force / Area

o = F/A (Here o represents (Rho) do not write in your examination paper)

 

Units:

 

- S.I or M.K.S System - N/m2 or Pascal (Pa)

- C.G.S system - Dyne/cm2

- F.P.S or BE System – lb/ft2 and lb/in2

 

(Here 2 in all above systems shows square)

 

 

Following are some types of stress:

 

1. Tensile Stress: It is a stress tending to stretch a body.

 

2. Bulk Stress: It is an overall force per unit area, also known as pressure.

 

3. Shear Stress: It is a stress tending to produce an angular deformation.

 

 

Strain:

 

Stress can produce a change in shape, volume or length in an object. This change in the shape of an object is called strain.

 

Formula:

 

Mathematically,

 

Strain = Change in Length/Length or Strain = Change in volume / volume

 

Units:

 

2 Since strain is a ratio between two similar quantities, it has no unit.

 

 

Following are some types of strain.

 

1. Tensile Strain: It is a change in length divided by original length.

 

2. Bulk Strain: It is the change in volume divided by original volume.

 

3. Shear Strain: It is equal to the angular displacement produced.

 

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