News tagged with friction
Part of Earth's mantle shown to be conductive under high pressure and temperatures
(PhysOrg.com) -- Scientists studying the rotation of the Earth have long known that our planet doesn't have a perfect spin. Most believe this is due to the different types of materials that make up the core, mantle and crust, ...
Jan 20, 2012 |
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Black hole jets
(PhysOrg.com) -- Black holes are irresistible sinks for matter and energy. They are so dense that not even light can escape from their gravitational clutches. Massive black holes (equal to millions or even ...
Jan 16, 2012 |
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Slippery when stacked: Theorists quantify the friction of graphene
(PhysOrg.com) -- Similar to the way pavement, softened by a hot sun, will slow down a car, graphene—a one-atom-thick sheet of carbon with wondrous properties—slows down an object sliding across its ...
Jan 11, 2012 |
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MIT suit puts a new wrinkle into feeling old (w/ video)
You've heard of the fat suit and the pregnancy suit; now meet AGNES - the old person suit.
Jan 03, 2012 |
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On the edge of friction
(PhysOrg.com) -- The problem exists on both a large and a small scale, and it even bothered the ancient Egyptians. However, although physicists have long had a good understanding of friction in things like ...
Dec 20, 2011 |
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Bobsled runs -- fast and yet safe
Lightning fast, the sled bolts down the icy run. Will the team make it to the finish faster than their competitors? The tension in the crowd depends partly on the run itself: the faster the sleds can travel ...
Space & Earth / Earth Sciences
Dec 01, 2011 |
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Researchers demonstrate earthquake friction effect at the nanoscale
(PhysOrg.com) -- Earthquakes are some of the most daunting natural disasters that scientists try to analyze. Though the earth's major fault lines are well known, there is little scientists can do to predict ...
Space & Earth / Earth Sciences
Nov 30, 2011 |
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Single-walled carbon nanotubes may serve as ideal probing tips to study friction, lubrication and wear at the microscale
Studying microscopic interactions at single asperities is vital for the understanding of friction and lubrication at the macroscale. Surface probe instruments with carbon nanotube tips may enable such investigations, ...
Nanotechnology / Nanomaterials
Nov 29, 2011 |
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Plant with 'eggbeater' testure inspires waterproof coating
A floating weed that clogs waterways around the world has at least one redeeming feature: It's inspired a high-tech waterproof coating intended for boats and submarines.
Nanotechnology / Nanomaterials
Nov 10, 2011 |
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Scientists examine the flow of liquid at the contact between randomly rough surfaces
A team of scientists from Italy and Germany has recently developed a model to predict the friction occurring when a rough surface in wet conditions (such as a road on a rainy day) is in sliding contact with a rubber material ...
Oct 19, 2011 |
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Study reveals that solidified lubricants do not change back to liquid form
A new study by GW Professor Yongsheng Leng, assistant professor of engineering and applied science, and postdoctoral scientist Yajie Lei, reveals that solidified lubricants in tight pores do not change back to a liquid form. ...
Oct 18, 2011 |
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Earthquakes generate big heat in super-small areas: study
Most earthquakes that are seen, heard, and felt around the world are caused by fast slip on faults. While the earthquake rupture itself can travel on a fault as fast as the speed of sound or better, the fault ...
Space & Earth / Earth Sciences
Oct 13, 2011 |
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Unlocking jams in fluid materials: A theoretical model to understand how to best avoid jamming of soft matter
In a study recently published in European Physical Journal E (EPJE), a German scientist constructed a theoretical model to understand how to best avoid jamming of soft matter that can be applied in food and cosmetics produc ...
Oct 05, 2011 |
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New spin on friction-stir
(PhysOrg.com) -- Researchers Zhili Feng, Alan Frederic and Stan David in Oak Ridge National Laboratory's Materials S&T Division have made significant progress toward a new metal processing technique, called ...
Jul 26, 2011 |
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Frog feet could solve a sticky problem
Tree frogs have specially adapted self-cleaning feet which could have practical applications for the medical industry.
Jul 03, 2011 |
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Friction
Friction 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.
