Chapter - 2 Friction

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Q
Friction

Question:

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.

We know, the force of friction depends on the nature of the surface, for the rough surface the friction is more as compared to the smooth surface.

Here, wet marble floor is most smother surface, then comes dry marble floor and newspaper and towel is the roughest between the three.

Therefore, the increasing order of friction will be:

wet marble floor < dry marble floor < newspaper and towel

 


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