News tagged with friction
Glasperlenspiel: Scientists propose new test for gravity
A new experiment proposed* by physicists at the National Institute of Standards and Technology may allow researchers to test the effects of gravity with unprecedented precision at very short distances -- a ...
Sep 01, 2010 |
4.6 / 5 (37) |
105
|
Stronger than steel, novel metals are moldable as plastic
(PhysOrg.com) -- Imagine a material that's stronger than steel, but just as versatile as plastic, able to take on a seemingly endless variety of forms. For decades, materials scientists have been trying to ...
Mar 01, 2011 |
4.8 / 5 (30) |
18
|
Researchers see exotic force for first time
(PhysOrg.com) -- For the first time, researchers have measured a long-theorized force that operates at distances so tiny they’re measured in billionths of a meter, which may have important applications in ...
Jan 07, 2009 |
4.8 / 5 (29) |
17
Friction research casts doubt on fundamental physics law
(PhysOrg.com) -- New research on frictional slipping has revealed that some of the basic assumptions of introductory physics do not hold at small scales. The findings may be useful in the study of earthquakes.
Oct 11, 2010 |
4.2 / 5 (27) |
8
|
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 |
4.1 / 5 (26) |
42
|
How people work... and the mystery of your fingerprints
Why do we chew our food? Research has shown that it is not, as has long been presumed, to make chunks of food small enough to swallow without choking. Biomechanics, who have modelled the cohesive strength ...
Jan 06, 2010 |
4 / 5 (14) |
20
|
Scientists investigate how ice melts below freezing due to nanowire's pressure
(PhysOrg.com) -- The many ways in which water differs from other molecules is both a scientific curiosity and an important factor in shaping the Earth. Among water's unique properties are that it expands when ...
Sep 02, 2010 |
4.7 / 5 (12) |
2
|
Not a drag: breakthrough will create cleaner, faster planes
(PhysOrg.com) -- A world first model for predicting fluid flows close to surfaces will enable engineers to reduce drag in vehicles, and in turn, lead to more efficient and greener planes, cars and boats, according to a University ...
Jul 09, 2010 |
3.5 / 5 (15) |
5
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 |
5 / 5 (9) |
3
Get a grip! Blistering new evidence on why we have fingerprints
(PhysOrg.com) -- Fingerprints do not help primates grip, as previously thought, scientists have discovered. They actually reduce the friction needed to hold onto flat surfaces. Now Dr Roland Ennos and his ...
May 29, 2009 |
4 / 5 (11) |
10
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 |
4.9 / 5 (9) |
15
|
Researchers reveal way in which possible earthquakes can be predicted
Researchers at the Hebrew University of Jerusalem who have been examining what happens in a "model earthquake" in their laboratory have discovered that basic assumptions about friction that have been accepted for hundreds ...
Space & Earth / Earth Sciences
Nov 30, 2010 |
4.2 / 5 (10) |
1
|
Simple Robot Climbs Through Tubes (w/ Video)
Last week was the IEEE's International Conference on Robotics and Automation, held in Anchorage, Alaska. One of the most interesting robots was a simple -- and fast -- bot designed to climb easily through tubes.
May 12, 2010 |
4.6 / 5 (9) |
2
|
Models present new view of nanoscale friction
(PhysOrg.com) -- To understand friction on a very small scale, a team of University of Wisconsin-Madison engineers had to think big.
Feb 25, 2009 |
4.8 / 5 (8) |
1
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 |
4.8 / 5 (8) |
4
|
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.
