what is friction? please help...?
826242
rubbing 2 things together to create heat.\nRub yor hands together really fast and see what happens.
65267
It's me again, Dhinesh,your classmate.\nrolling frictin is the friction caused due to rolling. it opposes rolling & it acts on a single point as there is a single pt. which has contact with surface
515562
Friction, Heat generated to name 2 reasons.
2716
The coefficient of friction is the ratio of the force needed to push an object and make it slide divided by the force downward on the object (e.g., weight) resisting motion.  It is used to determine the amount of force that is needed to make a smooth surfaced object of one material slide on a smooth surface of the same or a different material.  For every combination of materials there is a specific coefficient of friction.  Once calculated, the coefficient can be used for various loads (size of object).  Ice on teflon has one of the lowest coefficients of friction.  If you place an object on a plank and raise one end almost every object will slide before you reach an angle of 45 degrees.  Objects that have an adhesive property or are especially rough or have cogs will not have true coefficients of friction.  Once the coefficient of friction is known for a combination of materials (e.g., as determined in a lab) it can be used in many mechanical calculations where friction is present although the motion is more complicated than sliding along a floor.\n\nAn extra effort is sometimes needed to get an object to slide initially that is greater than steady state friction and that is sometimes called stiction.
835350
The coefficient of friction is the ratio between the force pressing two objects together and the force of friction between them. In the case of of sliding friction, this is literally the ratio of two forces. However in the case of static friction, this is the ratio of one force (the force pressing the two objects together, also called the normal force) to the maximum force that can be supplied by static friction. The actual force may be less than that. For instance, if the force tangent to the surface is less than the coefficient of friction times the normal force, the actual force of friction will be equal and opposite to the tangent force, and the object won't move.\n\nAnyway, the question asks whether there are any materials for which the coefficient of friction is greater than 1. A simple glance at a reference table, such as the one linked below, reveals the answer is yes.
26736
look up stuff like static friction, and your coefficient of friction...
492055
Rolling friction : http://webphysics.davidson.edu/faculty/dmb/PY430/Friction/rolling.html\n\nSliding friction: http://www.mtsu.edu/~phys2010/Lectures/Part_2__L6_-_L11/Lecture_10/Friction/friction.html
1061942
Friction due to atmosphere saves us from the meteors coming to earth, they are burned due to heat generated by air friction.\nFriction helps us walk and helps the working of brakes.\nThere are many to put here, refer some standard Physics books.
834102
1)  I'm not entirely sure.  It may just be the preference of that publisher, or just that the quantities being compared were not measured more accurately than to two places.\n\n2)  The coeffecient of friction is basically a measure of how well two surfaces slide against one another.  Pressing down simply increases the force, it does not necessarily change the structure of the surfaces in contact.\n\n3)  The coefficient of friction has no units because it is a ratio.  If you were to write out the units being compared in a fraction, say 2 Newtons / 4 Newtons, the units would cancel out when divided.
910713
at the moment there are the horizontal component of weight and the friction that opposes it are in equilibrium. we must apply a force that with the already present weight compontns will equal the kinetic friction. \nmeaning that \n\nWx + Fp = Friction.\n\n500cos20 + Fp = 0.6*500sin20 =>\n\nfp =367.24N
933078
You cannot get away from friction.  Material properties are also not going to be exact.
48671
Static Friction\nStatic friction is some thing that works in th plane between the object and the surface when the object is not moving .\n\nStatic friction has values from zero to the value of limiting friction force \n\nExample if it is needed 40 N force to over come frictional force .\n\nif your pulling the object at 10 N force then the object will not move as it is smaller then the force needed to move it \n\nsince your your pulling it at 10 N force and the object is not moving , then Static friction force has a value of 10 N \n\nif you increase the force form 10N to some 35N , the object will not move at this time since it is smaller then 40 N . at this point the value of static friction will be 35N \n\nStatic frictional force is equal to the force at which your pulling the object and is developed in the surface of contact and opposote to the pulling force \n\nif you pull it at 40 N then the object will have just the motivation to move and just enough to over come the limit of static friction which is called the limiting friction .\n\nthank you .. i hope it helps you
570511
both.  the friction, as well as creating its own heat, slows the airflow, which aggrivates the compression along the leading edges.\n\nI'm pretty sure.  don't put this on a physics test and then blame me.
883840
The force due to friction (whether static or kinetic) is dependent on the appropriate coefficient of friction (static or kinetic), between the materials, and the mass of the object (which defines the NORMAL force between the two surfaces). \n\nBy the way, the coefficient of static friction is ALWAYS greater than for kinetic friction.\n \nNow, no matter what the surface area, the normal force will remain the same, since the mass remains the same. In other words, no matter what side you put the block on, the force due to static friction and the force due to kinetic friction will not change.\n\nHope this helps!
12835
Friction occurs when two objects rub together, and is not dependent on gravity. So there would be friction even in outer space.\n\nProbably you are referring to air friction, which happens when objects move through the air. Since there is no air in outer space, there will be no air friction. That is why a moving spacecraft can turn off its rockets and keep moving forever in outer space (as long as it does not hit something or is pulled by gravity of a planet, moon or star).
891305
In the absence of friction, the acceleration of an object down a 12-degree slide would be\n\n9.81 * sin 12, or around 2.04\n\nInstead, your obejct is accelerating at 1.22.\n\nThe loss of acceleration due to friction is\n\n(9.81 * sin 12) - 1.22\n\nand the coefficient of friction is thus\n\n[(9.81 * sin 12) - 1.22] / (9.81 * sin 12)
362474
It's almost impossible to calculate that, for air friction there is a physical constant that is mentioned in mechanical physics. but for a table, there is still a massive amount of friction being applied from the table. so i don't think that it can be calculated since the air friction changes in regards to speed. it could probably be approximated in a lab thou.