**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

E_{1} / L_{1} = E_{2} / L_{2}

And K = elastic constant

*You may also like to check:*

How to Calculate Increase in Volume From Cubic Expansivity

How to Calculate the Resultant of Two Forces at an Angle

Refractive Index: How to Calculate an Apparent Displacement

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