how can we increase friction between two surfaces?
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There are two methods of increasing friction: one is by making the surfaces rough and the other by increasing the mass of the object that is moving. For example, the tyres of vehicles have treads (these are the 'designs' that you can see on the tyre surface), which increase the friction between the tyre and the road.
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Ways of Increasing Friction and Reducing Friction
Methods of Reducing friction
Wear and tear due to friction depends on two factors: the roughness of the two surfaces in contact and the amount of time the two surfaces rub against each other. Wear and tear of an object is not desirable as it reduces its life. This is more so in case of moving parts in automobiles and machinery. Therefore, efforts are made to reduce friction between moving parts.
Friction between moving parts is usually reduced by introducing a substance between the moving surfaces. This process is called lubrication. The substance introduced is called a lubricant. Common lubricants are oil and grease.
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