please answer this I will mark them brillant
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Gravity is the answer for first one
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- Lubricants such as castor oil and grease help in reducing the friction and they are used in machines to reduce the wear and tear of the surfaces that are in contact and also makes the working smooth. By making grooves and treading in the objects, the friction between these objects and the surface can be increased.
- (i). gravitational force, (ii). magnetic force
- We sprinkle powder on carrom board to make the surface of the board smooth. This reduces the friction between the surface of the carrom board, the striker and the coins.
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