In this exercise, We will learn about speed and its various types.
Speed simply tells us how fast an object can move.
Speed is a scalar quantity, which only tells the magnitude (numerical value) of how much speed that an object travels.
Speed is the rate of change of distance.
The SI unit of speed is meter(m)second(s)=ms=ms1
And, if we want to calculate the distance using speed and time, we can use the following formula,
We can classify the speed into two types with respect to distance and time.
Two types of speed:
  • Uniform speed
  • Non-uniform speed
Uniform speed:
If an object in motion covers equal distances in equal intervals of time, then the object is said to be at a uniform speed.
In our daily, life we can see the uniform motion in the following situation:
1. The circulation of blood in our body.
2. Movement of hands in a watch.
3. The movement of the fan and mixer in our kitchen at a particular speed.
4. The Earth and Moon rotate almost at a uniform speed.
Non-uniform speed:
If an object covers unequal distances in equal intervals of time, the object is said to be in non-uniform speed.
1. A car coming to a halt.
2. The object will moves at non-uniform speed, if it is thrown into the air, -for example, a cricket ball or stone.
3. The moment of a vehicle in traffic.
Average speed:
We can calculate the average speed of an object by dividing the total distance travelled by the object and the total time taken to travel the distance.
That is, Averagespeed=Thetotal distance travelledThetotal time taken to travel the distance