• Sliding friction comes into play when an object is sliding over another Friction depends on the nature of surface and the normal force with whic presses the other surface. Multis 1. W Friction is independent of area of contact, Friction can be reduced by using lubricants and ball bearings in many machine When bodies move through fluids, fluids exert a frictional force called Gear 2.1 MAO Improve your learning 3 Reflections on concepts G72TJZ 1. What kinds of friction do you know and explain with suitable example? As 2. A book placed on the surface of a table. The book is pushed in one direction 14
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Answer:
Friction is a contact force when two surfaces interact. Notice that both of these friction formulas only depend on the coefficient of friction and the normal force. It does not depend the area of contact; it doesn't depend on the sliding speed. Friction does not depend on the amount of surface area in contact between the moving bodies or (within certain limits) on the relative speed of the bodies. It does, however, depend on the magnitude of the forces holding the bodies together. Part of the standard model of surface friction is the assumption that the frictional resistance force between two surfaces is proportional to the normal force pressing them together. A common exception occurs in snow where greater traction occurs by having wider tires with lower pressure.
The force due to friction is generally independent of the contact area between the two surfaces. Note that this relationship breaks down when the surface area gets too small, since then the coefficient of friction increases because the object may begin to dig into the surface.
Big question is why does friction does not depend on surface area?
Since pressure equals force divided by the area of contact, it works out that the increase in friction generating area is exactly offset by the reduction in pressure; the resulting frictional forces, then, are dependent only on the frictional coefficient of the materials and the force holding them together.
Hope it is clear for you and like my answer.
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