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Force of friction depends on (a) Smoothness of the surface
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Roughness of the surface
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Inclination of the surface
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Smoothness of the surface
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All the above
That's Correct!
It's Wrong!
The force of friction depends on the smoothness of the surface because a smoother surface allows for less friction. It also depends on the roughness of the surface because a rougher surface creates more friction. Additionally, the force of friction is influenced by the inclination of the surface because a steeper incline increases friction. Therefore, all of the given options affect the force of friction.