Page 145 - SCERT Kerala State Syllabus 8th Standard Basic Science Textbooks English Medium Part 1_Neat

4. Bubbles rising from the bottom of the water filled in a bottle
are depicted in the figure. Which is the correct figure? Justify
your answer.

(a) (b) (c) (d)
5. A toy car of about 50 g placed on a polished table with
threads attached to it carrying two pans passed through
pulleys, is depicted.

(A) (B)

(a) What do you observe if 100 g each is placed on both pans?
(b) What do you observe if 100 g is placed on pan A and
200 g in pan B

(c) Justify your answers.

Extended activities

1. When area increases, pressure decreases. Find situations
where this principle is applied.

2. Find the disadvantages of friction in our daily life and suggest
remedy.
3. Organize, carryout and form inferences of an experiment to
prove that the frictional force exerted by different surfaces
are different.

144 Basic Science VIII