Question

Friction is a a necessary evil comment

Answer 1

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.

Hope it helps..

Answer 2

Frictional force causes a lot of losses in general upkeep and wear and tear of machinery. Hence it is considered as a evil. But almost all crucial tasks cannot be carried out without the presence of friction. ... Hence it is considered as a necessary evil .