Question

Why is friction a necessary evil?

Answer 1

Answer:

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Friction has so many undesirable effects. But still it is necessary for almost all the functions in our daily lives and for all the machines and their mechanisms

Answer 2

Answer:

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 .