Discussion
Sameer rolls his marble on three different surfaces spread out on floor - taut cellophane sheet, carpet and newspaper. The force of friction acting on the marble in the increasing order is
Answer: C
In increasing order of friction: cellophane sheet, newspaper, carpet.
Friction depends on the roughness of the surfaces in contact. A taut cellophane sheet is the smoothest of the three, so it offers the least friction and the marble rolls farthest on it. Newspaper is rougher, and a carpet, with its pile of fibres, is the roughest and offers the most friction, stopping the marble soonest.
The other orders either put newspaper below cellophane or carpet below one of the smoother surfaces, which reverses the roughness of the surfaces.
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