Home » Elasticity: How to Calculate the Strain in Physics

# Elasticity: How to Calculate the Strain in Physics ## Definition of strain

Steps that will help you to understand [ Elasticity: How to Calculate the Strain in Physics ]

Strain can simply be defined as the ratio of extension of the body to the original length.

Stress is the ratio of force to the Area. The unit we use to measure stress is in N/m

The mathematical expression for strain is

Strain = Extension (increase in length) / Original length

Extension or Increase in length = E

Original length = L

Also

Stress = Force (F) / Area (A)

## Example 1: [ Elasticity: How to Calculate the Strain in Physics ]

A piece of rubber 0.2m long stretches by 0.01m  when a load is hung on it. Calculate the strain.

Solution:

Data:

Original length (L) = 0.2

Extension (E) = 0.01

But, Strain = Extension (increase in length) / Original length

Thus,  Strain = L / E

By substituting our figures into the main formula, Strain = 0.01 / 0.2

Which implies that

Strain = 0.05

## Points to Note [ Elasticity: How to Calculate the Strain in Physics ]

Here are some vital points to note under elasticity:

### Elasticity

Is the ability of a body to regain its original shape and size after undergoing distortion.

### Elastic Limit

It’s the maximum stretching power of a wire.

### Deformation

This usually occurs when an object is stretched or compressed.

It is Plastic if the object does not regain its original shape or size. While it’s Elastic if the object regains its original shape or size.

### Breaking Point

When you stretch an object beyond its limit, the object might break in the process.

### Yield Point

Yield point is a point when you stretch an object beyond elastic limit and in the process, the body can no longer regain its original position.

### Hooke’s Law

According to Robert Hooke, “When a body is stretched, the extension of a wire is directly proportional to the load or force applied to its end, provided the elastic limit is not exceeded”.

That is E α L which shows that E = KL

Also, Force applied is directly proportional to the extension

Thus, Force (F) α Extension (E)

Which implies that

E1 / L1 = E2 / L2

And K = elastic constant

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