6. How the frictional force depends on area?
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Friction force depends on the nature of the surface in contact. If the surface area is rough then the frictional coefficient of the surface will also be larger thus will need more force to slide increasing friction. If the surface area is smooth the co-efficient of friction between two surfaces will be less.
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The force due to friction is generally independent of the contact area between the two surfaces. This means that even if you have two heavy objects of the same mass, where one is half as long and twice as high as the other one, they still experience the same frictional force when you drag them over the ground.
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