Question 3

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, towel newspaper

Force of friction depends upon the nature of the surface. Friction is more when more irregularities are present on the surface. A smooth surface have less friction. So, as in the increasing order of the force of friction, a wet marble floor have more irregularities so it shows the greater force of friction than the other whereas newspaper have less irregularities on its surface as compared to other. So, it exerts less force of friction.

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