A boy runs his toy car on dry marble floor, wet marble floor, newspaper and towel spread on the floor. The force of friction acting on the car on different surfaces in increasing order will be:
(a) Wet marble floor, Dry marble floor, Newspaper, Towel
(b) Newspaper, Towel, Dry marble floor, Wet marble floor
(c) Towel, Newspaper, Dry marble floor, Wet marble floor
(d) Wet marble floor, Dry marble floor, Towel, Newspaper

Friction between two surfaces increases as the roughness of the surfaces increases.

Here, wet marble is much smoother than dry marble, dry marble is smoother than newspaper, and towel and newspaper are smoother than a towel.

So, the increasing order of friction is as below:

Wet marble floor, Dry marble floor, Newspaper, Towel

So, option (a) is correct.

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Updated on: 10-Oct-2022

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