#### Rest

A body is said to be in the state of Rest if it doesn’t change it’s position with respect to time and surrounding.

**For example:** Bottle kept on a table, A table lying in a corner, Passengers sitting in a bus, train, aeroplane etc.

#### Motion

A body is said to be in the state of Motion if it change it’s position continuously with respect to time and surroundings.

**For example:** A fan moving, Flying a kite, Moving of a car, Boy on a swing etc.

#### Scalar Quantity

The quantity that deals with the magnitude only (numeric).

**For Example:** Distance, Speed, Work etc

#### Vector Quantity

The quantity that deals with the magnitude as well as direction.

**For Example:** Displacement, Velocity, Acceleration etc

#### Distance

It is defined as the actual length of the path covered by the body.

- The S.I. unit of distance is metre (m)
- It is a scalar quantity
- It can never be zero or negative

#### Displacement

#### It is defined as the shortest distance between the initial point and the final point.

- The S.I. unit of distance is metre (m)
- It is a vector quantity
- It can be zero or negative

#### Uniform Motion

A body is said to be in uniform motion if it covers equal distances in equal intervals of time.

#### Non-Uniform Motion

A body is said to be in non-uniform motion if it covers unequal distances in equal intervals of time.

#### Speed

Speed is defined as distance traveled by the object in unit time i.e. Speed = Distance/Time.

- It is denoted as V i.e. V = S/T.
- It is a Scalar Quantity
- The S.I. unit of speed is m/s.

#### Average Speed

The average speed of an object is obtained by dividing the total distance traveled by the total time taken i.e. Average Speed = Total Distance/Total Time Taken.

#### Velocity

Velocity is the speed of an object moving in a definite direction. The velocity of an object can be uniform or variable.

- Velocity = Speed + Direction
- V = Displacement/Time
- The S.I. unit of velocity is m/s.
- It is a Vector Quantity

#### Average Velocity

Average Velocity is given by the arthematic mean of initial velocity and final velocity for a given period of time i.e. Average Velocity = Initial

- Velocity + Final Velocity/2
- Mathematically : Average Velocity = U+V/2
- Average Velocity = Total Displacement / Total Time Taken

#### Types of Acceleration

**Positive Acceleration**

When final velocity is more than initial velocity in that case acceleration would be positive.**Negative Acceleration**

When initial velocity is more than final velocity in that case acceleration would be negative.**Zero Acceleration**

When a body moves with a constant velocity i.r. V=U in that case acceleration would be zero.

#### Accelerated Motion

**Uniformly Accelerated Motion**

An object travels in a straight line and its velocity increases or decreases by equal amount in equal amount in equal intervals of time, then the acceleration is said to be in uniform.

**For Example:**The motion of a freely body falling.

**Non-Uniform Accelerated Motion**

An object can travel with non-uniform acceleration if it’s velocity changes at a non-uniform rate.

**For Example:**If a car travels along a straight road increases it’s speed by unequal amounts in equal intervals of time, then the car is said to be moving in non-uniform accelerated motion.