Question

why the friction is a necessary evil

Answer 1

hey mate !!
friction is necessary evil as it acts on opposite direction of motion . it makes walking possible , and also we can stop while walking just because of friction.
hope it helps u..

Answer 2

HEY!!

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➡️Friction affects the relative motion between two bodies in contact.

➡️Without friction, objects cannot move from a stationary position or stop when in motion.

➡️Suppose you are walking on the road and encounter a smooth surface.

➡️You will fall because there will be no friction to hold your feet firmly on the surface.

➡️Now, let us change the situation. Let us suppose you are standing on a smooth surface and you are asked to walk on that surface.

➡️Again, you will not be able to walk properly because of lack of friction. Hence, friction is a necessary evil.