Q.

Friction depends upon:

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a

The area of the two surfaces 

b

Material of the surface

c

Nature of the surface

d

Nature and material of the surface

answer is C.

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Detailed Solution

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Friction depends upon the nature of the surface and the material of the surface. 
Friction is the force that resists a solid object's sliding or rolling motion over each other. For example, if the surfaces are smooth, there will be less friction than the rough surface. 

For example, a coin is rolled over a glass panel easily, but on cloth, it moves less than on a glass panel. 
 

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