Page 124 - SCERT Kerala State Syllabus 8th Standard Basic Science Textbooks English Medium Part 1_Neat

Uniform speed and Non uniform speed

Observe the figure showing the distances travelled by a car
during different time intervals.

0s 2s 4s 6s 8s 10s

A B C D E F

Fig. 9.7
Analyse Fig. 9.7 and complete Table 9.7

Distance travelled Time Speed
A B 20 m 2 s 10 m/s
B C
C D

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E F
Edubuntu
Table 9.7
Do you think that the distance travelled by the car in equal
intervals is the same? If so, isn't the car in uniform motion? In
such situations, we say that the car has uniform speed. Observe
Fig.9.8. The distance travelled by a car and the time taken for it
is recorded.

0s 2s 4s 6s 8s 10s

A B C D E F
0 5 m 20 m 26 m 44 m 50 m
Fig. 9.8
Analyse the figure and complete Table 9.8

Distance travelled Time Speed

A B 5 m 2 s 2.5 m/s
B C 15 m 2 s 7.5 m/s
C D
D E
E F
Table 9.8
Isn't the distance travelled by the car in equal intervals of time
different here? If so, is the motion and speed of the car uniform
or non uniform?

Basic Science VIII 123