Friction
hideFriction is the force resisting the relative lateral (tangential) motion of solid surfaces, fluid layers, or material elements in contact. It is usually subdivided into several varieties:
Friction is not a fundamental force, as it is derived from electromagnetic force between charged particles, including electrons, protons, atoms, and molecules, and so cannot be calculated from first principles, but instead must be found empirically. When contacting surfaces move relative to each other, the friction between the two surfaces converts kinetic energy into thermal energy, or heat. Contrary to earlier explanations, kinetic friction is now understood not to be caused by surface roughness but by chemical bonding between the surfaces. Surface roughness and contact area, however, do affect kinetic friction for micro- and nano-scale objects where surface area forces dominate inertial forces.
For more information about Friction, read the full article at
Wikipedia.
This text uses material from Wikipedia and is available under the GNU Free Documentation License.
News tagged with friction
Quantitative approach to forensic fingerprint comparison studied
Technology / Computer Sciences
2 hours ago |
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The National Institute of Justice (NIJ) has awarded researchers at Virginia Tech a two-year, $854,907 grant to develop a quantitative approach to measuring and establishing a standard for "sufficiency" of information available ...
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Engineer Discovers Why Particles Like Flour Disperse on Liquids
Nov 16, 2009 |
4.3 / 5 (15) |
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(PhysOrg.com) -- Even if you are not a cook, you might have wondered why a pinch of flour (or any small particles) thrown into a bowl of water will disperse in a dramatic fashion, radiating outward as if it ...
Nanotech in Space: Experiment To Weather the Trials of Orbit
Nanotechnology / Nanomaterials
Nov 24, 2009 |
4 / 5 (2) |
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Novel nanomaterials developed at Rensselaer were sent into orbit on Nov. 16 aboard Space Shuttle Atlantis.
Nanotech in Space: Rensselaer Experiment To Weather the Trials of Orbit
Nanotechnology / Nanomaterials
Nov 12, 2009 |
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(PhysOrg.com) -- Novel nanomaterials developed at Rensselaer Polytechnic Institute are scheduled to blast off into orbit on November 16 aboard Space Shuttle Atlantis.
Developing 'green' tires that boost mileage and cut carbon dioxide emissions
Nov 18, 2009 |
3 / 5 (2) |
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A new generation of "green" automobile tires that can boost fuel efficiency without sacrificing safety and durability is rolling their way through the research pipeline. The new tires could help add an extra mile or two per ...
Google Voice 'light' works with existing cell phone numbers
Oct 30, 2009 |
5 / 5 (1) |
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Google Voice, the service that can route calls to multiple phone numbers and access voice mail, is now available on users' existing cell phone numbers.
Superconductor magnet spacecraft heat shield being developed
Nov 26, 2009 |
4.8 / 5 (40) |
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(PhysOrg.com) -- European space agencies and an aerospace giant are developing a new re-entry heat shield that will use superconductor magnets to generate a magnetic field strong enough to deflect the superhot ...
NASA Assessing New Roles for Ailing QuikScat Satellite
Space & Earth / Space Exploration
Nov 24, 2009 |
4 / 5 (1) |
1
(PhysOrg.com) -- NASA mission managers are assessing options for future operations of the venerable QuikScat satellite following the age-related failure of a mechanism that spins the scatterometer antenna. ...
Bacterial 'ropes' tie down shifting Southwest
Nov 17, 2009 |
4.4 / 5 (5) |
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Researchers from Arizona State University have discovered that several species of microbes (cyanobacteria), at least one found prominently in the deserts of the Southwest, have evolved the trait of rope-building ...
Cross-country runabouts -- immune cells on the move
Nov 17, 2009 |
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(PhysOrg.com) -- In order to effectively fight pathogens, even at remote areas of the human body, immune cells have to move quickly and in a flexible manner.
Battery Research Aims To Store Renewable Energy
Nov 19, 2009 |
4.1 / 5 (13) |
6
The biggest chemical battery in the United States is located near Interstate 90 in the small town of Luverne, Minn. The 80 ton device -- the size of two tractor-trailers stacked on top of each other -- stores ...
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