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Question

Arrange the following in increasing order of surface roughness:


A
Sandpaper < Cardboard < Polished steel
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B
Polished steel < Cardboard < Sandpaper
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C
Polished steel < Sandpaper < Cardboard
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D
Cardboard < Sandpaper < Polished steel
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Solution

The correct option is B Polished steel < Cardboard < Sandpaper

Polished steel surface is the smoothest among the given surfaces because it has the least irregular surface followed by cardboard and sandpaper respectively. If we try to slide a block with same speed on all these surfaces, the block will move farthest on the polished steel surface because it offers the least friction.


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