Increasing Frictional Force: Using a cloth to open the lid of a bottle., Using a brush to clean a stain on the floor., Using a racquet's grip on the handle to increase the grip on the racquet., Decreasing Frictional Force: Using lubrication oil to smoothen a bicycle chain., Using flour or talcum powder to smoothen a carrom board., Using a trolley to move a heavy box.,

Unit 6 Y6: Force ( Ways to decrease/increase frictional force)

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