friction is necessity and also acts as an evil.explain?
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Friction is necessary for us. It is useful in walking, driving a vehicle on a surface, applying brakes to stop a moving vehicle, skating, writing on notebook/ blackboard, flying of airplanes, drilling a nail into a wall, sliding on a garden slide and many more.
Though it is useful for us, it has several disadvantages too. Main disadvantages include:
1) Friction produces heat which damages the moving parts of a machine. This reduces the life of machine parts.
2) Friction produces wear and tear on the contacting surfaces. Like wearing of tires and shoe soles etc.
3) A lot of energy is wasted in overcoming the friction before an object starts moving.
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