Understanding Non-Uniform Motion
We already know that depending on the value of speed, motion is of two types.
In Uniform Motion, speed of a body remains constant. The body covers equal distance in equal intervals of time.
In our daily life, only few objects maintain constant speed, that too in the same direction - i.e., only few objects are in uniform motion.
If we observe, most of the objects around us travel with various speeds and also keep on changing their speed.
Every time the speed of a moving object changes, the motion of the object becomes
$Non−Uniform$
.
Non-Uniform Motion
Let us recall the relation between speed, distance and time.
Suppose we are traveling in a car with a speed of 60 kmph...
In the 1st hour of our journey, we maintained the same speed and covered a distance of
$Distance=speed×time=60km$
After 1 hour our car started to give a trouble, so we decreased and moved at a lower speed of 40 kmph.
With the reduced speed we traveled for another hour, and in this hour, we covered
$distance=40kmph×1hr=40km$
.
Eventually we got our car serviced and increased our speed to 80 kmph.
With an increased speed we traveled for another hour and finally covered the distance of 80 km and finished our journey.
Let us tabulate the speed and the corresponding distance traveled for every hour of our journey.
From the table, we observe that our car was moving with a changing speed and hence it covered unequal distances in same intervals of time.
Thus, our car was in
$Non−uniformMotion$
.
Almost all the objects around us travel with
$Non−UniformMotion$
as their speed keeps changing most of the time.
A train coming to halt is an example of non-uniform motion as its speed decreases gradually and it covers lesser distances for same intervals of time.
Similarly, a stone dropped from a height is also in non-uniform motion. Its speed constantly increases with time.
With the increase in speed, as you can see, the stone starts covering greater distances in same intervals of time.
But does 'Change in Speed' - the only factor for a motion to be Non-Uniform ?
No, even objects moving with
$constantspeed$
can also be in Non-Uniform Motion if they constantly
$change$
their
$direction$
.
This is one interesting case in non-uniform motion.
For example, when a car is moving with a constant speed takes a turn, then its motion becomes
$Non−uniform$
.
Let's take a small REVISION
A body is said to be in
$non−uniformmotion$
if it travels unequal distances in equal intervals of time
Objects in non-uniform motion change their speed or direction or both.
The End