## Motion

Motion means movement. The motion of an object perceived when its position change continuously with to some stationary body.

## Or

An object may be apper to be moving to one person and the same object may be apper to be rest to another person.

The state of rest and motion relative only.

## Distance

*.*

**distance**

i. Actual length of path between two point.

ii. Shap of Path is not fixed.

iii. It is scaler quantity.

iv. The value of distance between two fixed point may be change because its depends upon path.

v. The distance between two point is never be zero or negative but only positive.

vi. S.I unit of Distance is Meters "M".

**Displacement**

The shortest distance between two point initial and final point of an object is called **.**

*Displacement***"M"**.

__Types of motion __

**i. Uniform motion**

*ii.Non uniform motion*### Uniform motion

*uniform motion**.*

### Non uniform motion

*.*

**Non uniform motion**## Speed

**.**

*speed***m/s**.

## Types of Speed

*i.Uniform speed.*

*ii.Non uniform speed*.

### Uniform speed – Equal distance covered in equal interval of time.

### Non uniform speed – Unequal distance covered in equal interval of time.

## Average Speed

## Velocity

**Velocity**.

__Types of velocity__

*i.Uniform velocity*

*ii.Non uniform velocity*.

**Uniform velocity**– Equal displacement covered in equal interval of time.

**Non uniform velocity**– Unequal displacement covered in equal interval of time.

## Average velocity

## Acceleration

Acceleration is defined as the rate of change of the velocity of the body with the time.

Let an object start moving with initial Velocity "u" and after time "t" second its Velocity change in final velocity "v", then acceleration 'a'

Acceleration = change in velocity/time.

Acceleration = final velocity – initial Velocity.

a = v–u/t.

S.I unit of acceleration is **m/s²**.

**When **

1- **v=u **, then acceleration is zero.

2- **v>u** ,then acceleration is positive.

3- **v<u** , then acceleration is negative. It is retardation or deacceleration.

__Types of Acceleration__.

There are two types of acceleration.

*i. Uniform Acceleration. *

** ii. Non uniform Acceleration**.

** Uniform Acceleration**:– When velocity of a body changes at uniform rate.

** Non uniform Acceleration**:– When velocity of a body changes at Unequal and non uniform rate.