Question

why friction is called necessary evil??? ​

Answer 1

Without friction we cannot set out the bodies in motion or stop the moving bodies. Thus friction is absolutely necessary for carrying day to day activities. On the other hand, it also wastes the time and energy, brings about wear and tear and slows down the motion. Thus, we can say that friction is a necessary evil.

Answer 2

Hey friend!!!

Here is your answer...

⬇️⬇️⬇️⬇️⬇️⬇️

⏩Frictional force causes wear and tear to the machinery and produce heat that causes sudden damage to vehicle so, it is called "evil".

⏩But without friction almost all our daily activities can not be done like waking, writing etc. So, it is necessary.

Hence it called as " necessary evil" ✔️✔️

HOPE that it will help you ✌️ ✌️