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Table of Coefficients
The coefficient of kinetic friction is always less than or equal to that of static friction.
The table below shows many coefficients of friction. Notice that each value is always given for a pair of surfaces. Friction doesn't work unless there are two surfaces.
Also note that there are values shown for both static friction and kinetic friction. Static friction deals with starting to move something, while kinetic friction deals with keeping something moving once it's already in motion.
In each case, it's also important to note that the coefficients of kinetic friction are always less than or equal to the coefficients of static friction. objectWrite('');
Coefficients of Friction for Pairs of Surfaces
Surfaces in Contact
Coefficient of Static Friction (s)
Coefficient of Kinetic Friction (k)
Wood on wood
0.5
0.3
Waxed ski on snow
0.1
0.05
Ice on ice
0.1
0.03
Rubber on concrete (dry)
1.0
0.8
Rubber on concrete (wet)
0.7
0.5
Glass on glass
0.94
0.4
Steel on aluminum
0.61
0.47
Steel on steel (dry)
0.7
0.6
Steel on steel (lubricated)
0.12
0.07
Teflon on steel
0.04
0.04
Teflon on Teflon
0.04
0.04
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What is formed where bumps from two surfaces come into contact?
Microwelds
Are Formed Where Bumps From Two Surfaces Comes Into Contact?
microwelds
What is formed when bumps from two surfaces come into contact?
Microwelds
What causes friction between two seemingly smooth surfaces?
Tiny collisions on the surfaces, called microwelds, cause friction.
What happens to friction if the force pushing surfaces together increases?
the larger the force pushing the two surfaces together the stronger the microwelds will be , because more of the surface bumps will come into contact , to move one surface over an other , a force must be applied to break the microwelds .
How do you break microwelds?
break it.
What is the definition of microwelds?
A microweld is an area where the microscopic bumps on two surfaces stick together. Microwelds are the source of friction.
What is formed where bumps from two surfaces come into contact?
Microwelds
What Are formed where bumps from two surfaces come into contact.?
microwelds
Are Formed Where Bumps From Two Surfaces Comes Into Contact?
microwelds
What is formed when bumps from two surfaces come into contact?
Microwelds
What force is caused by tiny collision's called microwelds on surfaces that are stuck together?
fricton
What happens to friction if the force surfaces together increases?
the larger the force pushing the two surfaces together the stronger the microwelds will be , because more of the surface bumps will come into contact , to move one surface over an other , a force must be applied to break the microwelds .
What causes friction between two seemingly smooth surfaces?
Tiny collisions on the surfaces, called microwelds, cause friction.
Microwelds are formed where?
bumps from two surfaces come into contact.
What happens to friction if the force pushing surfaces together increases?
the larger the force pushing the two surfaces together the stronger the microwelds will be , because more of the surface bumps will come into contact , to move one surface over an other , a force must be applied to break the microwelds .
Why do car wheels often spin on icy roads?
There are three misconceptions. Ice is slippery not because it's smooth or because its melting point drops when pressure is increased (tennis shoes still slip the same as skates). In addition, friction melting the ice has nothing to do with the slipperiness of ice (people standing still slip). The correct answer is that the surface of the ice has a microscopic film that is liquid-like. In a liquid, molecules are free to move around, but on the surface of ice, they move up and down. This also explains why when ice cubes are held together, they fuse. This was discovered very recently.
