Page 87 - Genius Kidz Prudence Learning Sc-8

4. Mark the statements as True /False .

(a) Barometer aids in the measurement of liquid pressure.
(b) Balloon is spherical in shape because gases exert pressure in all the directions.
(c) Force = Pressure × Area.

(d) Gravitational force is an example of non-contact force.

5. List at least five examples where pressure exerted by solids, gases and liquids is beneficial to us.

6. What makes the coaster placed over the rim of a glass of water stick even when you invert it?

7. Very short answer type questions.
(a) What is a manometer?
(b) What do you mean by the term ‘resultant force’?

8. Short answer type questions.

(a) What are the different methods that can be applied to reduce frictional force?
(b) “Pressure is exerted by solids”. Explain.

(c) Is pressure exerted by fluids? If yes, what are the characteristic features.
(d) What happens when a body leaves the earth's gravitational field?

9. Long answer type questions.
(a) Write a detailed note on force.

(b) Write a detailed note on pressure.
(c) What does a spring balance measure? How would you demonstrate the principle on which it
works?

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