Question

Lubricating the moving parts of machine:
i) increases friction
ii) decreases friction
iii) increases limiting friction
iv) none of these​

Answer 1

Answer:

decreases friction

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Answer 2

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Lubricating makes the surface smooth thus , lubricating the moving parts of a machine decreases fricition.

There are also some other processes like using ball bearings , reducing the contact between surfaces to reduce friction. If friction increases in a moving machine it may cause fire and wearing the parts of machine out . To avoid these results , lubricating is often done.