Whats the difference between traction and friction?...how do you define Traction?
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.
926875
friction is opposing force which opposes motion of body\naccrding to new studies fiction force exists due 2 the molecular interaction (forces)  b/w surface and body \nu can see here that more the roughness more the interacction b/w 2 bodies \nhence more fri. forc. hence more force is required 2 move body
764801
friction bad---- it is bad if you want to go ice skating friction will cause you stick and not be able to smoothly glide accross the ice\n\nfriction good- if you were at the top of a mountain at a 45 degree angle and the only thing keeping you there is the soles of your trainers and thefirm rugid edge of the mountain
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!
27382
advantage:\n\nfriction, resistance offered to the movement of one body past another body with which it is in contact. In certain situations friction is desired. Without friction the wheels of a locomotive could not “grip” the rails nor could power be transmitted by belts. \n\ndisadvantage:\n\nOn the other hand, in the moving parts of machines a minimum of friction is desired; an excess of friction produces heat, which in turn causes expansion, the locking of the moving parts, and a consequent breakdown of the machinery. Lubrication is important in minimizing friction as are also such devices as ball and roller bearings.
824753
For someone walking, it is STATIC friction that is acting, not KINETIC friction since the person's feet are not in motion relative to the ground while they are in contact with the ground (unless the person is slipping). So, in terms of the static friction, as a person walks, they are bushing backwards against the ground and the static friction is what is pushing against them, pushing them forward, so again it IS in the opposite direction to the force being applied.
1062743
D. The road.\n\nIf you draw a free-body diagram you'll see a frictional force vector pointing in the direction of motion.
333756
Friction causes motion. The greater the coeeficient of friction is, the more force is being applied. With enough friction, you could tear skin, or even your whole arm! you can reduce friction by not puttin anything on it. e.g., shirts, socks, clothing etc..
746903
duct tape. it adds just enough friction to give good traction, especially if you take a safety pin and scratch a bunch of grooves and crosscrosses in it. it'll come off eventually, but in the meantime it really works.
567649
do you mean surface?  as in surface area?  \n\nassuming you do, if you push on something with the same force, but the pushing is being done with objects of different surface area, the object with less area will create greater preasure, and the object with more surface area will create less preasure.  it's like if you're wearing high heals versus flip flops and you step on someone's hand with all your weight.  which will hurt more?  it's the same amount of weight each time, but one has a much smaller surface that's pressing on the hand--->way more pain
44667
You have a contradiction in your statement.  Static friction implies no movement but velocity is movement.  \n\nIf you mean the velocity of an object in dynamic equilibrium has a result of a frictional force (kinetic though) like sliding a block across the floor then you have to know the amount of work put into the system.  Then use work-kinetic energy theorem.
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
1024834
compression and friction
32662
actually the limiting friction is greater than kinetic friction.  it takes more force to overcome the forces of the limiting friction(start the object moving) then it does to overcome kinetic friction(keep the object moving). this makes sense logically, once the object is sliding, it's easier to keep it sliding then it is to start it moving in the first place...
886324
Think of it like this, if you have a car on ice, there is no friction. The wheels will spin, but the car won't go anywhere. If you have a car on pavement, the wheels spin and the car moves. This is  because the friction where the wheel is touching the pavement doesn't move. Instead,the wheel to rotates and the next part of the wheel touches the pavement and 'doesn't move'.\n\nHope that makes sense. I was never all that good with physics.
1026758
friction is equal to the normal force (such as weight) times the coefficient of friction. f = c of friction X normal. if you try to push a cardboard box on the ground, its kinda easy. now imagine putting a hundred pounds in that box. its harder to push becuase there's more friction holding the box back.
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!