Question

short answer questions
1. why friction is called a necessary evil
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Answer 1

Frictional force causes a lot of losses in general upkeep and wear and tear of machinery. ... But almost all crucial tasks cannot be carried out without the presence of friction. Basic activities like walking and writing on a surface are possible due to friction. Hence it is considered as a necessary evil.

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Answer 2

Answer:

friction has both harmful and beneficial effect and hence it is called a necessary evil.

Explanation:

mining in hindi

घर्षण का हानिकारक और लाभकारी दोनों प्रभाव होता है और इसलिए इसे एक आवश्यक बुराई कहा जाता है।