Hi everyone,
"In kinematics, the speed (commonly referred to as v) of an object is the magnitude of the change of its position over time or the magnitude of the change of its position per unit of time; it is thus a non-negative scalar quantity."Source
There are many units of speed used in different countries. For instance, speed of ships is calculated in knots whereas aeroplane usually used mach. Another interesting aspect of speed unit is that some countries have road limits in kilometres per hour while some have in miles per hour as the case maybe.
The standard unit for speed in science generally is metres per second.
The word per means in in each. Therefore metres per second means the number of metres travelled or covered by a moving object or objects in each second. For example, a horse or a car running with a speed of 15 metres per seconds means, the horse or the car in either case is moving or covering a distance of 15 metres in a second.
Metres per second is written as m/s as a short form unit identification in word problems
Formula for Calculating Speed
Speed is calculated based on how it is defined, which is metres per second.
For instance, a horse rider travels with his horse at a distance of 100m in a time of 20 seconds. So how many distance does this horse cover in each successive 1$ at the same distance?
To get this answer, we need to calculate the following information:
Number of metres travelled in each second is equivalent to speed
In a nutshell, speed= total distance covered/total time taken
Which is the same as =100/20 in m/s
=5m/s
In summary, speed=distance/time
Note: The term average speed is sometimes used because the speed of an object during a journey is not always constant or uniform. Constant implies not changing. Average speed is calculated in exact way a normal constant speed is calculated and derived.
The formula or equation for calculating speed from scientific analysis or problems can be done in three dimensions. This means that speed equation can also be used to calculate or derive the distance travelled or covered if the speed and time is known and also time taken if the speed and the distance is given.
In summary, these are the equation of speed and its derivatives in three dimensional analysis.
1- Speed= distance/time
2- Distance= Speed*time
3- Time travelled= distance/speed
That's all as regards brief description of speed as an example of physical quantities in pure sciences. More would be discussed about other quantities in subsequent posts. Thanks and regards for reading up to this juncture of the post and happy reading.
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