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# What is inertia?

Inertia is the property of the matter which is the resistance persuaded by a matter to change its state, each object has a mass that tends to resist the external forces responsible for moving it from one state to another state, this physical property of matter is called inertia.

According to the first law of motion, an object remains in its own state until and unless an external force is applied to it. The first law of motion clears the concept of inertia, inertia relates to the first law of the motion because according to it a body opposes a change in itself, this characteristic of a thing with mass opposing a change is known as inertia, therefore it is the inertia of the object due to which if a body is in moving state it remains in moving state and if the object is in the static position it remains in a static position.

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## What is inertia?

### Table of content:

• Definition of inertia
• First Law of motion
• Types of Inertia
• Examples of Inertia

### Definition of inertia:

Inertia is defined as a property of matter by which it remains at the state of rest or in uniform motion in the same straight line unless acted upon by some external force. If a body is in a motion then it remains in the same motion or if a body is in a state of rest it remains in the rest position until and unless an external force applies to it.

### First Law of the Motion:

To understand the concept of inertia we are needed to understand the First law of motion, Newton’s first law of motion states that if a body remains in its own state of action until and unless an external force is applied to it.

### Types of Inertia:

The Inertia of rest: If a body is rest position then it remains in the rest position until an external force is applied to it.

The inertia of motion: If a body is in a state of uniform motion then it remains in the same uniform motion until an external force is applied to it.

The Inertia of direction: If a body is moving in a certain direction then it remains in the same direction until an external force is applied to it.

### Examples of Inertia:

1. If the cardboard is arranged to be kept in the mouth of a tumbler and a coin is placed on the cardboard, when we drag the cardboard to our side by catching one of the ends, the coin falls inside the tumbler, here coin maintains its own initial state and fell inside the tumbler.

2. When a driver suddenly stops the bus, the passenger’s head is stuck on the next seat, it happens because the seats and the lower part of the passenger’s body are attached to the bus. The lower part of the body comes to the rest position with the bus but the upper part of the body due to the inertia carried at the same speed as that of the bus, the head of the passenger is struck on the next seat.

3. The satellite around the earth carried on a uniform circular motion after launching to space, it maintains the circular motion under the impact of the constant gravitational force, since there is no external force acting on the satellite, it revolves around the earth with uniform circular motion.

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