Alex runs his toy car on a dry marble floor, wet marble floor, and towel spread on the floor. The force of friction acting on the car on different surfaces in increasing order will be:

Dry marble floor, wet marble floor, towel

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Towel, dry marble floor, wet marble floor

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Towel, wet marble floor, dry marble floor

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Wet marble floor, dry marble floor, towel

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Solution

The correct option is D Wet marble floor, dry marble floor, towel
The nature of the surfaces in contact decides the frictional force between them. It will be more if the surfaces in contact are rougher.

A towel is more rough than a marble floor. Hence, the force of friction on the toy car will be maximum in its case.

On wet marble floor, water acts as a lubricant. Therefore, the force of friction on the toy car will be minimum in its case.

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