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1. using grease or any other lubricant 2. using smoother surfaces 3. using fluids of lower viscosity (measure of resistance to flow) 4.Use rollers, wheels or ball bearings and 5.Objects like cars and planes are modelled with streamlined shapes.
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smooth surface have high intensity of friction as i've read
Apply greese,or oil between the machine parts.smoothen the surface ,use ball bearinngs. giving streamlined shapes to vehicles  etc are the different methods to reduce friction
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