Arjun runs her toy bus on the dry cemented floor, wet cemented floor, paper and blanket spread on the floor. In which of the following options, surfaces are arranged in the correct order of increasing frictional force offered by them on bus?

Wet cemented floor, dry cemented floor, paper and blanket

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Paper, blanket, dry cemented floor, wet cemented floor

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Blanket, paper, dry cemented floor, wet cemented floor

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Wet cemented floor, dry cemented floor, blanket, paper

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Solution

The correct option is A Wet cemented floor, dry cemented floor, paper and blanket
Frictional force between surfaces depends on the nature of surfaces in contact. The frictional force will be more if the surfaces in contact are rougher.
The wet cemented floor is the least rough, hence it offers the least frictional force. The blanket is the most rough surface, hence it offers the most frictional force. Then, the correct order of surfaces in terms of increasing frictional force offered by them on bus is: wet cemented floor, dry cemented floor, paper and blanket.

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