News tagged with friction
Finnish researchers find explanation for sliding friction
Friction is a key phenomenon in applied physics, whose origin has been studied for centuries. Until now, it has been understood that mechanical wear-resistance and fluid lubrication affect friction, but the fundamental origin ...
May 29, 2012 |
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A nanoclutch for nanobots
Chinese researchers have designed and tested simulations of a "nanoclutch," a speed regulation tool for nanomotors.
May 24, 2012 |
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Friction stir welding unites reliability, affordability
(Phys.org) -- NASA's next heavy-lift launch vehicle, the Space Launch System, is moving further in development faster thanks to proven advanced technologies like friction stir welding.
Space & Earth / Space Exploration
May 21, 2012 |
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Magnetic fields can send particles to infinity
Researchers from the Complutense University of Madrid (UCM, Spain) have mathematically shown that particles charged in a magnetic field can escape into infinity without ever stopping. One of the conditions ...
Apr 17, 2012 |
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Future naval force may sail with the strength of titanium
Steel may have met its match: An Office of Naval Research (ONR)-funded project will produce a full-size ship hull section made entirely with marine-grade titanium using a welding innovation that could help bring titanium ...
Apr 04, 2012 |
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Cutting-edge study shows teeth can be used to determine what has been eaten
You are what you eat is truism that has been given new impetus by 'cutting edge' research led by the University of Leicester that reveals your teeth are literally shaped by your food.
Other Sciences / Archaeology & Fossils
Apr 03, 2012 |
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Researchers validate simplified lateral force calibration technique for atomic force microscopy
(PhysOrg.com) -- Researchers from the NIST Center for Nanoscale Science and Technology and the NIST Material Measurement Laboratory have demonstrated that a simpler technique for calibrating lateral sensitivity ...
Mar 29, 2012 |
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New nano-measurements add spark to centuries-old theory of friction
The phenomenon of friction, when studied on a nanoscale, is more complex than previously thought. When friction occurs, an object does not simply slide its surface over that of another, it also makes a slight up-and-down ...
Mar 26, 2012 |
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Mechanical engineers study snakes' sophisticated frictional properties to build more nimble rescue robots
Snakes! Love them or hate them, everyone can agree they are superb at sliding over complex terrain. Learning the slithery reptiles' tricks can provide valuable tips for designing rescue robots to help locate ...
Feb 29, 2012 |
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Increasing rainfall may affect winds: study
(PhysOrg.com) -- Falling raindrops produce friction as they drop through the atmosphere to the ground, and this dissipates the kinetic energy, converting it into diffuse heat. Now researchers in the US have ...
Space & Earth / Earth Sciences
Feb 24, 2012 |
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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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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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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.
