Segregate the things in to two columns, one which increases friction and the other which reduces friction ,choose from things given below Oil,mud,cement floor,smooth surface,ridges,coarse powder,grease,dry skin,ball bearings,wet floor ,rough surface,close interlocking of objects.
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Diffusion is the movement of a substance from an area of high concentration to an area of low concentration. Diffusion happens in liquids and gases because their particles move randomly from place to place. Diffusion is an important process for living things; it is how substances move in and out of cells.
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