# Concise notes for class 9 physic Force and Laws of Motion

## Class 9 Physics chapter- Force and Laws of Motion

"Force is the cause which can produce acceleration in the body on which is acts".

### Types of Forces

The forces that we come across in our daily life, are divided into two types:

1. Balanced Forces
2. Unbalanced Forces

### Balanced Forces

If the resultant of all the forces acting on a body is zero, the forces are called balanced forces.

### Unbalanced Forces

If the resultant of all the forces acting on a body is not zero, the forces are called unbalanced forces.

### Newton's First Law of Motion

According to this law - A body continues to be in a state of rest or in a state of uniform motion along a straight line unless compelled by an external force to change its state of rest or of uniform motion.

### Types of Inertia

Inertia can be divided into three types:

• Inertia of Rest: The tendency of a body to oppose any change in its state of rest is known as inertia of rest.
• Inertia of Motion: The tendency of a body to oppose any change in its state of uniform motion is known as inertia of motion.
• Inertia of Direction: The tendency of a body to oppose any change in its direction of motion is known as inertia of direction.

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