Wear and tear due to friction depends on two factors the roughness of two surfaces its content and teh amount of time the two surfaces rub against each other. Frictional force can be reduced in the following ways :

1. Use of Lubricants: Friction can be reduced by applying lubricatns between the contact surfaces to fill the fine pores or depressions in the surfaces and make them smooth thereby reducing friction.
2. Polishing: Unevenness of the surfaces can be reduced by polishing, thereby reducing the friction.
3. Use of ball bearings: In rotating machines, shafts are mounted on ball bearings. By doing so, rolling friction occurs lesser than sliding friction, thereby reducing the friction.
4. By streamlining: Air friction is reduced by designing streamline bodies of cars and aeroplanes. Similarly, if the bodies of boats and ships are streamlines, friction of water can be reduced.