Question

4. Give two situations where it is desirable to increase friction.
5. What is ‘streamlining'? How is it useful?​

Answer 1

4)Two situations where it is desirable to increase friction are: Tyres have designs and patterns with grooves on the surface to increase fraction with the road. This presents slipping of the tyres on the wet road.

5)Streamlining is a design that offers the least resistance to the flow of a fluid, especially air or water. Friction is minimum for a streamlined shape, which is rounded in the front and narrow at the back. It is useful as: ... Ship also have streamlined shapes to reduce friction with water. Even fishes are streamlined bcoz it helps them to swim easily in water.

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Answer 2

Answer:

Sw

Explanation:

Situation:swimming in hot water

And aeroplane in air

Streamlining :School nhi gaya tha aus din