In this case, the frictional force may depend on the area of contact. 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. an example for this is seen in cars.When the area under contact is more, in tyres, the milage(kms covered per litre of petrol) of the car reduces as more friction acts on the tyre,thus resulting in the need of more power for attaining a particular speed. It is true that wider tires commonly have better traction. Answer This is a good question and one which is commonly asked by students when friction is discussed. Friction is the force resisting the relative motion of solid surfaces, fluid layers, and material elements sliding against each other. - Duration: 6:39.

When the surfaces are adhesive, Coulomb friction becomes a very poor approximation (for example, Scotch tape resists sliding even when there is no normal force, or a negative normal force). It does not. Friction is the product of coefficient of friction and normal force. $\begingroup$ If the load R is constant and the area is varying then in coulomb friction the frictional force would not vary. They independently presented the creep versus creep force relation for a cylinder on a plane or for two cylinders in steady rolling contact using Coulomb’s dry friction law (see below). whereas in case of rolling friction, friction factor is very much dependent on the area of contact. Friction is the product of coefficient of friction and normal force. Like the sliding and fluid frictions rolling friction also doesn't depend on the area of surface, rather it depends on the meterials in contact i.e. The coefficient of friction depends on the materials in contact with each other. The force of friction comes from the surface characteristics of materials that come into contact. It doesn’t. It does not depend the area of contact, it doesn't depend on the sliding speed. Friction is the product of coefficient of friction and normal force. When the nature of surfaces of the two body if in contact or are same then friction depends on area of contact .in this situation friction is directly proportional to area of contact. The friction force depends on two things: – The normal force (Rn) – The nature of the surfaces involved (µ) Ffriction =µ⋅Rn – The friction force does not depend on the surface area (contact area). Rolling resistance, sometimes called rolling friction or rolling drag, is the force resisting the motion when a body (such as a ball, tire, or wheel) rolls on a surface.It is mainly caused by non-elastic effects; that is, not all the energy needed for deformation (or movement) of the wheel, roadbed, etc., is recovered when the pressure is removed. Section 23.3.2 described the origins of rolling friction and scratching friction in terms of the volumes of material deformed and the nature of the deformation, in particular the energy dissipation processes involved. If you would have a rigid wheel and surface rolling without slip, then you would have no have a line contact between the wheel and the surface parallel to the axis of the wheel, which has zero surface area. It does not. Friction • The friction force acts in a direction parallel to the area of contact, and opposes the motion or the tendency to move. then u can stop following me 0.0 The main reason why this is so does not relate to contact patch, however, but to composition.

The coefficient of friction depends on the materials in contact with each other. There are several types of friction: Dry friction is a force that opposes the relative lateral motion of two solid surfaces in contact.

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