Though we use the terms **speed and velocity** interchangeably without knowing the actual concept, but there is a **difference between speed and velocity** which everyone must know.

In fact, it is also an examiner favorite topic, asked in board exams and competitive entrance exams like **JEE and NEET** and competitive exams like** RRB NTPC, RRB Group D, SSC CGL and state PSC’s. **

Both **speed and velocity** convey different meanings, that is speed refers to the time rate at which an object moves along a path, whereas the rate and direction of that object’s movement will be velocity.

Here we provide the **difference between speed and velocity based on NCERT** in tabular form.

## Difference between speed and velocity class 9 NCERT

Properties | Speed | Velocity |
---|---|---|

Definition |
The rate at which an object covers a certain distance is known as speed. | The rate at which an object changes position in a certain direction is known as velocity.
Or , Velocity is the speed of an object moving in a definite direction |

Formula |
Speed = Distance / Time | Velocity = Displacement / Time |

Type of quantity |
Speed is a Scalar quantity | Velocity is a Vector quantity |

Magnitude |
Speed of a body is Positive or Zero but it cannot be negative. | The Velocity of a body can be zero, negative, or positive. |

Change of direction |
The average speed will continue to count even if the object changes direction. | The velocity of the object changes with the change in direction, therefore the object must follow one direction. |

Interrelation |
Speed may or may not be equal to the velocity. | An object may possess different velocities but the same speed. |

Average Value |
The average speed of an object is the total distance travelled by the object divided by the total time taken. | The Average velocity is given by the arithmetic mean of initial velocity and final velocity for a given period of time. |

Formula of Average value |
Average Speed (s) = Total distance travelled (d) / Total time taken (t) | Average Velocity (v) = [Initial velocity (u)+ Final velocity (v)] / 2 |

Example |
Suppose, a motor van travelling at 20 m/s , The speed of the motor van is 30 m/s. | Suppose a Bus going towards the north direction with an average speed of 30 km/h, So the velocity of the Bus is 30 Kilometers per hour northwards. |

**Note:**

**♦ Always remember Speed and velocity have the same SI units, that is, m s –1 or m/s. ** (Meter per second)