Page 170 - Science Class 07

UNIFORM AND NON-UNIFORM MOTION constant speed. On this basis, we can categorise

Mo ons mo on into uniform mo on and non-uniform
mo on.
When you travel in a car or bus, you observe

that it doesn’t move with a constant speed. Uniform Mo on : When an object moves with
Some mes, it moves with the speed of 30 a constant speed and cover equal distances in
km/h. Some mes, speed goes up and again it equal intervals of me, we say that this mo on
slows down. It generally happens when we is uniform mo on.
move in a crowded place. But when we move Look at the following table which displays the
on clear road, we generally move with a distance covered by a car in given me:
constant speed. Trains generally move with
Table : 1
Time covered Time taken Total Distance Distance In equal interal

1:00 pm 0

1:05 pm 5 Minutes 5 km 05 – 00 = 5 km
1:10 pm 5 Minutes 10 km 10 – 5 =0 5 km

1:15pm 5 Minutes 15 km 15 – 10 = 5 km
1:20 pm 5 Minutes 20 km 20 – 15 = 5 km

1:25 pm 5 Minutes 25 km 25 – 20 = 5 km

The table shows that the car is moving with a Non-uniform mo on : When an object covers
constant speed. It is covering 5 km in every 5 unequal distances in equal intervals of me.
minutes. We can also say that it is covering 1 The object is said to be in non-uniform mo on.
km in every 1 minute. Therefore, the car is said Look at the following table which displays the
to be in uniform mo on. distance covered by a car in given intervals of

What do you observe in the given graph? It me:
shows that when we plot a uniform mo on on
a graph it is always a straight line.
Table : 2
Distance Covered
Time covered Time taken Total Distance Distance
in equal interval
1:00 pm 0 0

1:05 pm 5 Minutes 5 km 5 – 0 =0 5 km
1:10 pm 5 Minutes 9 km 9 – 5 =0 4 km

1:15pm 5 Minutes 14 km 14 – 9 =0 5 km

1:20 pm 5 Minutes 16 km 16 – 14 = 2 km
1:25 pm 5 Minutes 20 km 20 – 16 = 4 km

The above men oned table clearly shows that intervals of me, i.e., 5 minutes. It means the
the car is covering unequal distance in equal car is in non-uniform mo on.

170 Science-7