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Does friction force depends on surface area directly or indirectly?
Wiki User
∙ 16y ago
Friction force has NO "surface area" component. This is hard to understand (and it sounds like the teacher who asked this question doesn't quite understand either...). Imagine this-- A block of wood with a flat bottom and a legged wooded stool sit on a smooth inclined plane. Do we have to know the contact area (surface area) of the block or the stool legs to determine the angle at which each will slide? No. We merely need to know the applied weight and the coefficient of friction between the materials. So why does a dragster have such big smooth tires? Wouldn't thin knobby bicycle tires do as well? As far as the friction force is concerned, Yes. But the issue the dragster faces is how to transfer the engine power to the asphalt to accelerate the car. This involves HUGE problems of material strength, power, heat and wear that takes the problem far outside the narrow concerns of friction force.
Wiki User
∙ 16y ago
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Does a rough surface have a lot of friction?
Rough surfaces do create more friction than smooth surfaces. How much friction is created depends on how rough the surface is.
The amount of friction depends on what?
Friction depends on the surface that the object is going against. If an applied force is used to push a box on a ground, the friction is the surface of the ground, may the ground be rough or smooth, there is a force that goes against the applied force. Air friction is also a type of friction that many physics question does not account for, because it is a virtually small force.
What are the factors which affect the coefficient of static friction?
Dry surfacesFor low surface pressures the friction is directly proportional to the pressure between the surfaces. As the pressure rises the friction factor rises slightly. At very high pressure the friction factor then quickly increases to seizingFor low surface pressures the coefficient of friction is independent of surface area.At low velocities the friction is independent of the relative surface velocity. At higher velocities the coefficent of friction decreases.Well lubricated surfacesThe friction resistance is almost independent of the specific pressure between the surfaces.At low pressures the friction varies directly as the relative surface speedAt high pressures the friction is high at low velocities falling as the velocity increases to a minimum at about 0,6m/s. The friction then rises in proportion the velocity 2.The friction is not so dependent of the surface materialsThe friction is related to the temperature which affects the viscosity of the lubricant
State laws of friction?
There are five laws of friction. These include "within large limits, kinetic friction is independent of velocity" and "friction depends on the type of surface where contact is made."
What are the two main factors on which friction depends?
roughness of surface explain.... please..
How does the coefficient of friction depend upon the normal force between the surfaces in contact?
-- The friction force changes, and is directly proportional to the normal force. -- The coefficient of friction doesn't change. It is the proportionality constant in the first statement.
What happened to the coefficients of friction as the surface area of the contact increased?
As the coefficient of friction is not function of the area or not related to the area of the contact surface so the coefficient of friction remains constant on the increase of the contact area. The coefficient of friction depends upon the material of the friction surfaces only.
What happened to the coefficients of friction as the surface area of the contact increases?
As the coefficient of friction is not function of the area or not related to the area of the contact surface so the coefficient of friction remains constant on the increase of the contact area. The coefficient of friction depends upon the material of the friction surfaces only.
How surface influences the amount of friction there is?
The larger the contact surface, the more friction. The more uneven the surface, the more friction. The material of the surface has also an effect on friction.
How do different weights affect friction?
Friction is a resistance force imparted on an object sliding across a surface where the force is directly proportional to the WEIGHT of the object. The heavier the object that is moving across the surface the higher the frictional forces.
How will different masses affect friction?
friction depends on type of surface and force applied its not dependent on the mass till gravitation is taken into account
How much friction is produced by brakes to stop a vehicle running at 80kmhr?
friction acting btw the road surface and wheel depends upon the braking retardation of the vehicle. every surface has its own friction coefficient which represents the maximum value , however friction can act in range from 0 to that max value , and this value depends upon the braking retardation.
