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Alida runs her 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 and 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
Answer
(a) Wet marble floor, dry marble floor, newspaper and towel.
Friction depends on roughness of the surface.
Wet Marble Floor is the most smooth
After that, dry marble is more smooth than newspaper and towel
And, Newspaper is smooth than towel as it has no irregularities
