A) wet towel
B) oily marble floor
C) surface of cardboard
D) surface of a new tyre
Correct Answer: B
Solution :
Friction is maximum on a rough surface and it is minimum on a smooth surface. In addition, application of lubricants on surfaces reduces the friction. Oil is a lubricant. Application of oil on a marble surface reduces its friction. Hence, friction of an oily marble floor will be the minimum among the given surfaces. The correct answer is B.
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