Question

friction is a necessary evil. give with example

Answer 1

It is evil because it opposes us all from doing anything and it is necessary because it is very important in doing various tasks like walking, writing, etc.

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Answer 2

 Without friction, we wouldn't have heat and therefore no life. Fire cooks food, moves cars and puts men on the moon. 

Friction is also how things accelerate (change velocity). Nothing would be able to move without friction unless it collided with another object. 

We get a lot of use out of friction, with the only downside being that friction results in energy being "lost" in the form of heat (energy cannot be created/destroyed, but when energy moves from one body to another some is converted to heat). If we could achieve zero friction, perpetual motion would be possible which would result in limitless energy.