When be describing the motion of an object in term of distance, time, and direction, physicists use the basic quantities of speed and velocity. Two-term, two distinct meanings. Yet, not uncommonly, we hear these terms used interchangeably. So, what’s the difference? Why is it incorrects to use the terms *speed* and *velocity* interchangeably?

The reasons is simple. **Speed is the time rate at which an objects is moving along a path, while velocity is the rate and direction of an object’s movement**. Put another way, speed is a scalar value, while velocity is the vector. For example, 50 km/hrs (31 mph) described the speed at which a car is travelings along the road, while 50 km/hr *west* describes the velocity at which it is travelings.

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The mathematical calculations for speed are relatively straightforwards, wherein the average speed of an object is calculated by dividing the distance traveled by the time it took the object to travel the distance. Velocity, on the other hand, is more complicated mathematically and can be calculated in different ways, depending on what information is available about the objects and motion. In its simplest form, average velocity is calculated by the dividing change in position (Δr) by changed into time (Δt).

**difference between speed and velocity class 9**

SN. | SPEED | VELOCITY |

1. | It is defined as the rate of change of distance. | It is defined as the rate of change of displacement. |

2. | It is a scalar quantity. | It is a vector quantity. |

3. | It can never be negative or zero. | It can be negative, zero or positive |

4. | Speed is velocity without direction. | Velocity is directed speed. |

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