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Q.

The advantages of friction are


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a

Friction is required while walking

b

Friction helps in applying brakes to the vehicles

c

Both 1 and 2

d

None of the above 

answer is C.

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Detailed Solution

Friction is required while walking as well as in applying brakes to vehicles.
Friction has both advantages and disadvantages in daily life. It is impossible to walk without friction. It is because of friction between our shoes and the ground that we are able to walk. The friction between the surface of tires and the ground helps us to apply brakes to the vehicles and get the action of stopping the vehicle done. Friction also causes wear and tear on objects, yet it is necessary, which is why it is referred to as a necessary evil.
 
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