Page 171 - Science Class 07

We can plot graph on the basis of the distance covered by the car and me taken. We plot distance
on y-axis and me on x-axis.

Y Y
Uniform Mo on Non-Uniform Mo on

30 30

25 25
Speed
20 20
Distance 15 Speed Distance 15

10 10

5 5

0 X 0 X
1:00 1:05 1:10 1:15 1:20 1:25 1:00 1:05 1:10 1:15 1:20 1:25
Time Time
Graph for Table : 1 Graph for Table : 2

1. How can you say that a par cular body is in mo on?
2. How can a body be brought in mo on?

3. If a bus covers a distance of 720 km in 6 hours, what is the speed of the bus?

4. What is uniform mo on?
5. A car covers 3 km in every 5 minutes. Is the car in uniform mo on? Describe with the help
of a graphs.

Sundial : A setup which gives time using the movement of sun and formation of
shadow
Revolution : Movement of the earth around the sun

Rotation : Movement of the earth on its axis
Quartz : Crystals which show vibration
Motion : Continuous change of position of a body with respect to the observer

Speed : Distance covered by an object in a unit time
Odometer : A device which displays the distance covered by the vehicles in kilometres
Speedometer : A device which displays the speed of a running vehicle

Uniform motion : A constant speed, i.e., equal distance covered in equal interval of time

Science-7 171