Question

c. Mention one method which can used to reduce friction in following situations.
1. To reduce friction in wheels of cars.
2. To reduce squeaking sound in door.
3. To reduce friction in heat producing grinding machines.
4. To change rough surface into smooth surface.
5. To reduce fluid friction in objects,​

Answer 1

Answer:

To reduce friction, oil is added to the engine. The oil coats the surfaces of the moving parts and makes them slippery. They slide over each other more easily, so there is less friction

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Answer 2

Answer:

1 rolling friction

2 sliding friction

3 static friction

4 polishing friction