Page 131 - SCERT Kerala State Syllabus 8th Standard Basic Science Textbooks English Medium Part 1_Neat

a body travelling along a straight line with uniform velocity.

a body travelling along a straight line with non-uniform
velocity.

a body travelling along a circular path with uniform speed.
a body travelling along a circular path with non-uniform
speed.
8. A lorry travelling with a velocity of 30 m/s came to rest in
5 s. What is its acceleration?

9. What is the displacement of a car in 30 s if it is travelling with
a velocity of 15 m/s?
10. Observe the figure showing the path of a body which started
from A and moved to C through B.

B

60 m
40 m
6s 4 s
A C
70 m

a. Calculate the speed of the body.

b. What is the velocity of the body?
c. What is the velocity of the body if it has taken 5 s to reach
A back from C?

d. Compare the velocity of the body when it reached C from
A and also when it reached A from C.

Extended activities

1. Find out situations in which acceleration is possible without
changing the speed. Tabulate them.

2. Do vehicles travelling by your school premises obey speed
limit? Find it out by undertaking a research project and
present the report.
3. Organise a seminar and present a paper on 'Road Safety
measures'.

130 Basic Science VIII