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Q.

Is it true that the smoothness of the surface reduces friction?


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a

True

b

False 

answer is A.

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Detailed Solution

The above statement is true.
The force of friction depends on the nature of the surface in contact, the smoothness of the surface reduces the friction whereas the roughness of the surface increases it. For example, Ice and glass are two smooth surfaces that are simple to slide across. They barely cause any friction at all. Sand and rock have far higher friction than smooth surfaces.
 
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