. A boy runs his toy car on dry marble floor


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

Best Answer

Answer. A

As the roughness of the surface increases, the friction force increases

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