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Question

Which of the following factors affect friction ?

A
Nature of the surface
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B
Weight of the object placed over other
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C
State of Motion of the object
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D
All of the above
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Solution

The correct option is D All of the above
Friction force f=μN
Where,
μ is coefficient of friction. Its value depends on surface roughness or nature of surface, state of motion. If an object is in motion, Kinetic friction coefficient (μk) comes into use whereas when it is in rest then Static friction coefficient (μs) comes in use, and generally (μs)>(μk).
N is normal contact force, which depends on the weight of the object.
From the above discussion, we can say that Friction force depends on the nature of the surface, Weight of the object placed over others, State of Motion of the object.
Hence Option D

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