Question

फ्रिक्शन कैन बे डिक्रियाज्ड बाय यूजिंग​

Answer 1

Answer:

1. POLISHING: When we polish a surface, its roughness ( unevenness )decreases. The surface becomes smooth and friction gets reduced. we also sometimes rub the surfaces with the fine sand paper to reduce their unevenness.
2. LUBRICANTS: We all know that when a few drops of oil are poured on hinges of a door, the door moves much more smoothly. Bicycle and motor mechanics use grease between the moving parts of this machines.In all these cases,we want to reduce friction in order to increase efficiency.Oil-like substances,which help to reduce friction when put on a surface, are called lubricants

lubricants can be (I)liquid like oils (ii)semi liquids like trees and (iii)solids like talcum powder.

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