how can friction be reduced??
543751
add a lube like an oil
89189
Use a self-lubricating sleeve ... you can find those on line
109063
Strictly speaking, friction is force that is the product of a constant for the friction producing device (coefficient of friction) and the perpendicular force between two rubbing surfaces. When sliding occurs, friction does not change with speed, but stopped (static) friction may exceed sliding friction.  Traction typically refers to the force that prevents a tire from skidding and may include friction, adhesion, hydrodynamic, aerodynamic and aerostatic (suction) effects.\nEDIT:\nAnd contextually, traction is almost always beneficial while friction may be.
399579
It would screw up a lot of calculations and other assigned physical values. Since no friction at all is 0 you would be claiming less friction than none. It is set up the way that it is for much the same reason that there are limits to aerodynamic lift and other forces that are nonsensical when allowed to become either negative or larger than one.
751590
1. Changing roughness - make the surface smoother\n\n2. Instead of sliding surfaces together, you can add rollers between the surfaces, thus changing over to rolling friction.\n\n3. By adding a thin layer of oil or even water between two objects, you convert the sliding friction to fluid friction. This lubrication is used in many applications to reduce wear and to make the sliding much easier.
66741
Rubber in contact with other surfaces can yield friction coefficients from 1.0 to 2.0.\n\nhttp://en.wikipedia.org/wiki/Friction
591397
limit friction is the maximum amaount if of friction which makes a object just to move
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.
766251
They do sell these handy nylon pads that one sticks on the feet of chairs and tables to make them easier to slide across a floor or a carpet. They reduce the friction between the wooden feet and the floor.\n\nThey also sell rubber pads to stop the feet of chairs and tables slipping easily. They increase the friction.\n\nYou also have friction tape, as used by skateboarders on their boards or by people who put it along the top of a step so that people don't slide and fall. Its rough on the top like sandpaper and that increases the friction between the sole of the shoe and the surface that was slippery before it was taped.\n\nI'd vote for the shoes idea. Very elegantly thought. For luck, you could bring a pair of shoes that you always slip in in the rain, and a pair of sport shoes with which you never slip. Gives you more to talk about, but just explaining the shoe and sock idea would be adecuate.
153998
If you examined almost any surface under very high magnification, what looked smooth to the naked eye would look like endless mountain ranges in all directions.  If you then place two such surfaces together using weight or another force to join them and tried to move one surface relative to the other, the opposing "mountains" would have to slide up and over each other or even break (shear) the mountain tops.  The resulting resistance to motion is called friction.  When mountain tops are sheared, the energy forcing the motion is converted to extremely high local heat at the molecular level as bonds between millions of atoms and molecules are broken.  Friction causes heat and can quickly destroy an engine bearing that loses its lubrication.\n\nThe high heat of friction can actually cause a lubricant (oil, etc.) to break down and bond (as olifins) to the metal parts making smoother surfaces, especially when the parts are held apart by a film of circulation oil that carries away excess heat to a heat exchanger.  Grease (which is often a mixture of soap and oil) is thicker than oil and can fill the microscopic mountain valleys so that the parts slide on opposing layers of grease reducing friction and heat.\n\nWhen you push on a heavy crate, you must apply enough force to overcome the static friction (sometimes called stiction) and start the crate moving.  Continued motion creates dynamic friction generating a constant supply of heat.\n\nIf you place any object on a board and lift one end, all materials (combinations of board (incline) and object (load) will slide before the board reaches an angle of 45 degrees.  The higher the board angle, the higher the coeficient of friction.  This method can be used to calculate the coefficients of friction for various combinations of materials (board and load).  Ice on teflon has perhaps the least coefficient of friction and is very slippery.  The objects and board should not serve as cogs or act as adhesives to get valid results.\n\nFamily friction (strife) is the only kind of frictioon that can be reduced by flowers or a hug and a kiss.  That may cover most of the other types of friction, right?
198734
The force of friction is dependent on two things, the Normal force between the "object" and the "surface" and the coefficient of friction between the two.\n\nThe normal force on a level surface is equal the weight of the object.  You are given the mass, from this, you can easily calculate the force of weight (and this F_n).\n\nYou are given the coefficient of friction, greek letter mu.\n\nThe force of friction can be found as,\nF_f = F_n * mu\n\nThe force of friction is always in the direction opposite that of the motion.  So if your traveling "forward", the frictional force is pointed "backward".\nWhat are the two components in the formula that affect the magnitude of the frictional force?  Just the normal force (which is dependent on mass and gravity) and the coefficient of friction.  For all intensive purposes, mu is constant, as is the mass and gravity of the object.  Therefore, the force of friction is constant.\n\nYou are given in initial velocity.  You are trying to find how far (change in distance) the car will travel while this constant force is being exerted on it before the car comes to a stop.\nThere are several ways this could be found.  I think the energy method would be the easiest, but I will cover the kinematic method as well....\nThe car has some initial kinetic energy when the problem starts out.  KE = 1/2 mv^2.  After the car comes to a stop, the car has zero KE...therefore some work had to be done on the system to change the energy (we assume a level road).  The change in KE equals the work done.  Work is also equal to the product of the force applied over the distancd applied.\nW = F * d\nSince the frictional force is what is causing this change in energy (which we know, it was calculated earlier), and we also know the change in KE, we can simply solve for the distance, d.\n\nThere is also another possible solution.\nWe know that the frictional force will cause an acceleration.\nF = m*a\nWe know that an acceleration will cause a change in velocity.  We know ,\nv_f^2 = v_i^2 + 2ad\nwhere v is velocity (i is initial, f is final), a is acceration, and d is distance.  Simple solve for d.
931739
By lowering temperature.
937470
Getting started, have to overcome static friction.  Therefore, force applied = static friction force just before movement\n\nF = umg\nF = 75N\nm = 20kg\ng = gravity\nfind u, plug and play\n\nsame problem for sliding friction
962609
The M/A of a wedge (disregarding friction) = cot(wedge angle)\n\nUnfortunately, there's a LOT of friction, so it's not so simple after all!
949778
"-Static friction is the friction acting on a body when the body is not in motion, but when a force is acting on it. Static friction is the same as the force being applied (because the body isn't moving). Static friction acts because the body tends to move when a force is applied on it.\n- Limiting friction is the friction on a body just before it starts moving. Generally, limiting friction is highest.\n-Kinetic friction is the friction which acts on the body when the body is moving. Kinetic friction is usually smaller than limiting friction", source: wiki
379528
Friction and erosion.
845875
Ah, time to dig out the physics from last year.  If I remember correctly:\n\nStatic friction is when the force of friction is greater than the force applied; thus basically what amount of force it takes to move the object from rest.\n\nKinetic friction is when you apply a force for an object to keep sliding.  In this, it "breaks free" of your push and continues sliding.\n\nAnd the force needed to initially break the static friction (to get it moving) is much more than what is needed to keep it going.\n\nHope this helped a bit.  Just remember that static friction is associated with objects at rest and kinetic is objects in motion, and don't get the two mixed up. :*P\n\nHave fun with physics!