Question

friction a necessary evil . justify

Answer 1

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Is is a general misconception that friction always opposes motion between two bodies in contact ,but actually it opposes relative motion between two bodies in contact .In many cases friction is found as the cause of motion .without friction it is impossible to imagine this world.Friction is evil in mechanical machines causing wear and tear of parts.Friction causes wear and tear of tyre but in turn is impossible to rotate tyre…and many more.

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Answer 2

Answer:

Explanation:

Friction is a necessary evil as it has both advantages and disadvantages.

Advantages:

1.Helps persons to walk on road

2.Helps vehicles to stop smoothly

Disadvantages:

1.Causes wear and tear in machines

2.Increases maintenance cost