And what about different situations, such as elastic deformation? How does physics predict those characteristics theoretically? As for why it has no dependancy on surface area, realise that as the surface area increases, the force is more distributed and hence there is a lower pressure at the surface between the object and the ground. Although a larger area of contact between two surfaces would create a larger source of frictional forces, it also reduces the pressure between the two surfaces for a given force holding them together. this is because the more surface area facing the direction in which it is going, the more air is pushing against it. Question: How does the surface area of the block affect the force of friction or the coefficient of friction? Fore example, take two identical pieces of paper. However, coefficient of friction, μ, actually does depend on the temperature of the materials. Surface does NOT affect force of friction. so that μ will tend to change less than in the case less surface area.
Thus frictional force depends on mass and μ. μ for any two objects is fixed. The greater the surface area, the less the increase in temperature (The thermal energy is dissipated over a wider area.) The force of friction comes from the surface characteristics of materials that come into contact. The frictional force is proportional to the normal force acting on the surface (which is oftentimes just the weight of an object on a surface) with the coefficient of friction being the proportionality factor. The scrunched one will hit the ground first as it has less surface area. It doesn’t. So, as long as the surfaces are relatively uniform, meaning they do not change in microscopic texture from one region to another, the amount of area in contact does not affect the frictional force.
Asked by: Elizabeth Stewart Answer Although a larger area of contact between two surfaces would create a larger source of frictional forces, it also reduces the pressure between the two surfaces for a given force holding them together. If it dependent on the area of two objects.
Why doesn't friction depend on surface area? But how exactly does the roughness or smoothness of a surface affect its sliding friction? Scrunch one up and throw them from two meters high. The amount of sliding friction between two surfaces is affected by a number of factors, one of the most obvious being surface texture. Among them are the force per unit area; the higher that is the more concentrated the stress is put on both the friction material and the counter surface. Detailed knowledge of surfaces that come into contact is something people have to measure themselves (or they can check a table of information after someone else has done all the work). Devise an experiment that can test your hypothesis. Even if friction was normally independent of surface area, one has to consider a couple of things. The formula for friction is .
So you can put more power to the ground. It is desirable to have very smooth increase in friction with increased contact pressure (macro), and this dictates a macro surface area, that is hugely greater than the real micro contact area.
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