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Is it true that frictional force doesn't have any disadvantages?

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a

True

b

False

answer is B.

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Detailed Solution

The above statement is false.
When friction helps us with many things, it also has some disadvantages.
Friction wastes energy by creating extra heat that is not necessary. Friction slows down the velocity of moving things because its force acts in the opposing direction of motion. Friction between tree branches is what starts forest fires. Due to friction, the wear and tear of machines increases.
However, by adopting methods like greasing and oiling, friction and the typical wear and tear it causes can be significantly reduced.
The correct statement would be that frictional force has disadvantages.

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Is it true that frictional force doesn't have any disadvantages?