Friction does not depend upon the apparent area of contact but depends very much on the real area of contact. Asked by: Mark Secunda Answer This is a good question and one which is commonly asked by students when friction is discussed. For example consider experimentally moving three different cubic blocks of the same material across the same surface. Friction Force Does not Depend on Area of Contact by http://physicsgalaxy.com/home.html Watch thousands of videos and learn Physics in an easy manner! This can be explained easily - When pressure acts upon two surfaces in contact (maybe due to weight) and the surfaces have relative motion, the lateral friction force tends to shear the crests on the respective material surfaces.

For surfaces in relative motion, μ is the coefficient of kinetic friction (see below), the Coulomb friction is equal to Ff, and the frictional force on each surface is exerted in the direction opposite to its motion relative to the other surface. First, it appears to be independent of surface area. Friction. It is true that wider tires commonly have better traction. But in this lecture he shows an application where the friction helps in balancing a large weight (T2) with a much smaller weight (T1). Friction is a sliding force between an object and a ground that acts opposite on the motion of an object. How does physics predict those characteristics theoretically? Explain. 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. 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). Question: Why doesn't friction depend on surface area? Notice that both of these friction formulas ONLY depend on the coefficient of friction and the normal force. As a car nut, I know that wider tires have better traction. There is a lot more to friction than what you learn in a first course in mechanics. Friction. How do you explain this contradiction? It doesn’t. Contrary to popular belief friction does not depend on the surface area. Why doesn't friction depend on surface area? Notice that both of these friction formulas ONLY depend on the coefficient of friction and the normal force. The force of friction comes from the surface characteristics of materials that come into contact. It does not depend the area of contact, it doesn't depend on the sliding speed. Question: Why doesn't friction depend on surface area? The coefficient of friction between two objects is determined by experiment and has a couple of interesting characteristics. It does not depend the area of contact, it doesn't depend on the sliding speed. I know friction doesn't depend on surface area and the professor has been demonstrating the same in all the previous lectures. Friction is a sliding force between an object and a ground that acts opposite on the motion of an object. Explain. As an engineer, I know that friction does not depend upon surface area. The frictional force is a contact force that can be either static frictional force or kinetic frictional force. The area of contact is a very small fraction of the total surface area of the two objects. I conducted a few experiments with a block of wood on various surfaces. Friction. Question: Does friction depend on surface area?

Surface area is one of the two factors, the other is pressure at the interface (between the two surfaces). The frictional force depends on the coefficient of friction {eq}\mu{/eq}... See full answer below.



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