Velocity

Claimed by Stacey Nduati.

Velocity is the time rate of change of position of a body in a specified direction. It is a vector quantity that consists of a magnitude and direction.

Equation

Average velocity can be calculated using the following equation:

[math]\displaystyle{ \boldsymbol{\bar{v}} = \frac{\Delta\boldsymbol{r}}{\Delta\mathit{t}} }[/math] ,

where [math]\displaystyle{ {\Delta\boldsymbol{r}} }[/math] is the change of direction of the object and [math]\displaystyle{ {\Delta\mathit{t}} }[/math] is the change of time.

The SI units for velocity are meters per second (m/s).

Examples

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Instantaneous Velocity

Instantaneous velocity is the speed and direction of an object at a particular instant.

For example: A car takes 3 hours to make a 230-mile trip from Point A to Point B. For the first hour, the car travels at 80 mph. For the second hour, the car travels at 90 mph. For the third and final hour, the car travels at 60 mph. Each hour has a different instantaneous velocity.

Average Velocity

Average velocity is the net displacement of an object, divided by the total travel time. It is the average of all instantaneous velocities.

Looking at the previous example: The average velocity would be (230 miles/3 hours) = 76.67 mph.

Notes

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External links

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References

Book