Oiling and greasing between moving parts of a machine.
Full Marks : 1 (a) increases the friction
(b) reduces the friction
(c) changes the sliding friction into rolling friction
(d) changes the static friction into sliding friction,
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changes the sliding friction into rolling friction
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Answer:
b) reduces the friction
Explanation:
By using oil, grease,ball bearings,etc., friction can be reduced
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