2007-02-24 15:03:51 · 6 answers · asked by FLea_Botomy 1 in Science & Mathematics ➔ Physics
Coefficient of friction and mass of object.
Coefficient of friction can be static friction or moving friction depending id object is at rest or already moving, and it depends on the roughness of the objects surface as it rubs another surface. It also involves if there are forces of attraction between the two surfaces and all of these are taken as coefficient of friction.
Technically it is not the mass of the object per se which determines the final force required to counteract friction, it is the force perpendicular to the two surfaces in shearing.
2007-02-24 15:11:37 · answer #1 · answered by JoeReal 3 · 1⤊ 0⤋
Factors Affecting Friction
2016-10-28 06:34:09 · answer #2 · answered by Anonymous · 0⤊ 0⤋
Regardless of what is said, no-one REALLY knows what causes friction, although there are plenty of good ideas (I have some idea about this, as I am doing a PhD in rock shear strength - hence the name Rocdoc).
The main cause of friction is the interaction of two surfaces - both at a macroscopic (big) and microscopic (very small) level. At the big scale, surface variations interact with each other and act to impede sliding motion. At the very small scale, chemical interactions such as adhesion are in effect (especially if the surfaces are forced against each other). Also, temerature and chemical composition (of the materials rubbing together) has an effect.
What is unusual (and difficult to predict) is the impact surface variations have on each other at various scales. Just as chaos theory uses the coast line of a continent as an example of varying surface edges shapes at different scales, so to is this relevant to friction, due to the change of surface variations (and hence interactions) at various scales.
Thus it is the interaction of random surface 'aspertities' (think surface shapes) that cause the majority of the effect of friction. That is why adding confinement increases frictional resistance - more energy is required to overcome interacting asperities as they are forced together. Eventually, these aspertities will break and friction will decrease rapidly to some residual level. Just imagine rubbing two cheese grater against each other, and pressing harder and harder each time you try!
Remember, all the other theoretical stuff (e.g. given in Wikipedia) is useful, but friction is still not completely understood.
~Rocdoc
2007-02-24 15:36:22 · answer #3 · answered by Anonymous · 2⤊ 0⤋
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RE:
what are the factors affecting friction?
2015-08-15 16:45:02 · answer #4 · answered by Shannan 1 · 0⤊ 0⤋
Normal force and the coefficient of friction, which depends on the roughness and stickiness of the surfaces.
Normal force is the force exerted on an object by the surface it is on. For example, if you are sitting on the floor right now, the floor is pushing up on you with a force equal to your weight. If someone tried to slide you along the floor, they would have to push harder to slide you if you were holding a heavy object, because that would increase the normal force exerted on you by the floor. They would also have to push harder to slide you if you were wearing rubber pants, because of the way they "grab" the floor. (This is an example of changing your coefficient of friction.)
2007-02-24 15:10:36 · answer #5 · answered by Dennis H 4 · 1⤊ 0⤋
the Mu (Coefficient of friction), Normal force, and force of friction
2007-02-24 15:07:03 · answer #6 · answered by Anonymous · 0⤊ 0⤋
how rough the surfaces are
how hard you press the two objects together.
2007-02-24 15:07:48 · answer #7 · answered by 7 · 0⤊ 0⤋
wikipedia to the rescue, its been a while since I did pyhsics LOL
2007-02-24 15:07:58 · answer #8 · answered by Keiko 2 · 0⤊ 1⤋
egh its blurd
2014-01-07 22:17:59 · answer #9 · answered by Basti Reyes 1 · 0⤊ 0⤋