Question

Friction can be reduced by *

(a) polishing

(b) lubrication

(c) streamlined shape

(d) all of the above

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Answer 1

Explanation:

b is the correct answer

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Answer 2

Answer:

lubrication

Explanation:

when oil grease any other lubricants are applied beyween the moving parts of a machine a thin layer is formed between the moving surfaces and hence they do not directly rub against each other inter locking of irregularities is avoided to a great extent by the application of lubricants .hence become smooth