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# Topic: Coriolis force

###### In the News (Wed 15 May 13)

 Coriolis effect - Wikipedia, the free encyclopedia The Coriolis effect is an apparent deflection of a freely moving object as observed from a rotating frame of reference. The formula implies that the Coriolis acceleration is perpendicular both to the direction of the velocity of the moving mass and to the rotation axis. The force balance is largely between the pressure gradient force acting towards the low-pressure area and the Coriolis acceleration acting away from the center of the low pressure. en.wikipedia.org /wiki/Coriolis_force   (2017 words)

 Coriolis Effect   (Site not responding. Last check: 2007-10-21) Coriolis showed that, if the ordinary Newtonian laws of motion of bodies are to be used in a rotating frame of reference, an inertial force--acting to the right of the direction of body motion for counterclockwise rotation of the reference frame or to the left for clockwise rotation--must be included in the equations of motion. The Coriolis deflection is therefore related to the motion of the object, the motion of the Earth, and the latitude. Thus, the Coriolis force figures prominently in studies of the dynamics of the atmosphere, in which it affects prevailing winds and the rotation of storms, and in the hydrosphere, in which it affects the rotation of the oceanic currents. abyss.uoregon.edu /~js/glossary/coriolis_effect.html   (469 words)

 Coriolis effect   (Site not responding. Last check: 2007-10-21) The Coriolis force plays a strong role in weather patterns, where it affects prevailing winds and the rotation of storms, as well as in the direction of ocean currents. The Coriolis effect must also be considered in astronomy, and stellar dynamics, where it affects phenomena such as the rotational direction of sunspots. A practical application of the Coriolis force is the mass flow meter, an instrument that measures the mass flow rate of a fluid through a tube. www.sciencedaily.com /encyclopedia/coriolis_effect   (994 words)

 Coriolis Force: an artifact of the earth's rotation This apparent deflection is called the "Coriolis force" and is a result of the earth's rotation. As air moves from high to low pressure in the northern hemisphere, it is deflected to the right by the Coriolis force. In the southern hemisphere, air moving from high to low pressure is deflected to the left by the Coriolis force. ww2010.atmos.uiuc.edu /(Gh)/guides/mtr/fw/crls.rxml   (195 words)

 Wind as a Factor in Arctic Weather and Climate The Coriolis effect is zero at the equator and increases to a maximum at the poles. The resultant balance between the pressure force and the Coriolis force is such that, in the absence of surface friction, air moves parallel to isobars (lines of equal pressure). Above the so-called Atmospheric Boundary Layer where friction is negligible, the pressure gradient force and the Coriolis force are in balance and the wind blows parallel to the isobars. nsidc.org /arcticmet/factors/winds.html   (818 words)

 Coriolis force   (Site not responding. Last check: 2007-10-21) The Coriolis force is one of the forces that is added in the transformation between inertial and noninertial reference frames. The Coriolis force associated with horizontal water movements is perpendicular to the instantaneous direction of movement, to the right in the northern hemisphere and to the left in the southern hemisphere. The magnitude of the acceleration produced by the Coriolis force is very small, and produces significant deflections only when the particles are moving very fast or moving slowly for a long time. www.unc.edu /courses/2000fall/masc054-001/forces/forces/node4.html   (325 words)

 Wind and Pressure The magnitude of the Coriolis force is, in part, dependent on the latitude of the volume of air that is moving, and also on the velocity of movement of the volume of air. As our parcel of air (under the influence of only the horizontal pressure gradient force and the Coriolis Force) moves from the region of high pressure/height toward the region of low pressure/height, it curves to the right (in the northern hemisphere) until eventually it is moving parallel to the straight isobars/isoheights. It is not a new force, rather it is simply showing the effect that the Coriolis force and the friction force have in a direction opposite to the horizontal pressure gradient force. www.met.tamu.edu /class/Metr304/WindandPressuredir/wind-press-stu.html   (4309 words)

 BBC - h2g2 - Coriolis Force Coriolis force is an imaginary force invented to account for the odd behaviour of objects which move far enough in rotating frames of reference. It is named after Gustave Gaspard Coriolis (1792-1843), the French mathematician and physicist who first described it in 1835 in a paper entitled ‘On the equations of relative motion of a system of bodies’. Coriolis force is, like centrifugal force, a convenient fiction designed to account for the discrepancy between the normally reliable Newton's first law, and actual experience in rotating frames of reference. www.bbc.co.uk /dna/hub/A576146   (1298 words)

 The Bathtub Vortex, Alaska Science Forum The second factor contributing to a preferred direction of rotation is the Coriolis effect, which diverts moving objects (such as projectiles, airplanes, or, in the present case, water) to the right in the northern hemisphere and to the left in the southern hemisphere. As long as the water in the basin is at rest, the Coriolis effect plays no role, but, in the northern hemisphere when a plug is pulled and the water begins to move toward the drain, it is deflected ever so slightly to the right. Although the Coriolis effect is not a "force" at all, as it is sometimes called, it must be dealt with when one is working with a rotating system such as a carousel or the earth. www.gi.alaska.edu /ScienceForum/ASF5/523.html   (674 words)

 "Getting Around The Coriolis Force" - Revised Nov 15, 2000 The Coriolis effect is a force in the first sense, but not in the second sense: nothing is actually pushing or pulling on anything, the acceleration is due to the fact that the observer is moving in a circle. As a result, the Coriolis effect generally doesn't have a noticeable effect to people on the ground; the speed of the point you're standing on and the speed of the point you're stepping onto are too close for you to tell the difference. The Coriolis effect "pushes" them away from the axis, and gravity pulls the object back down to the ground so that the remaining effect is an apparent "push" to the south. www.physics.ohio-state.edu /~dvandom/Edu/newcor.html   (2564 words)

 Coriolis force (from mechanics) --  Encyclopædia Britannica The Coriolis force is a pseudoforce that operates in all rotating frames. Coriolis showed that, if the ordinary Newtonian laws of motion of bodies are to be used in a rotating frame of reference, an inertial force—acting to the right of the direction of body motion for counterclockwise rotation of the... The concept of force is commonly explained in terms of Newton's three laws of motion set forth in his Principia Mathematica (1687). www.britannica.com /eb/article-77558?tocId=77558   (811 words)

 Coriolis   (Site not responding. Last check: 2007-10-21) Coriolis was offered Cauchy's position at the École Polytechnique but by this time he was highly involved in his research and decided not to take on any further teaching duties. Coriolis continued teaching at the École Polytechnique until 1838 when he decided to end teaching and take on the role of director of studies. The contribution of Coriolis, Poncelet, and Navier to the concept of 'work' is examined in detail in [6]. www-history.mcs.st-andrews.ac.uk /history/Mathematicians/Coriolis.html   (824 words)

 Does water go down the drain counterclockwise in the northern hemisphere and clockwise in the southern hemisphere? ... The Coriolis force is caused by the earth’s rotation. The Coriolis Effect is the observed curved path of moving objects relative to the surface of the Earth. The Coriolis force is too weak to operate on the moving air at the equator. www.loc.gov /rr/scitech/mysteries/coriolis.html   (496 words)

 USATODAY.com   (Site not responding. Last check: 2007-10-21) In simple terms, in the Northern Hemisphere, while the Coriolis force is pushing the wind toward the right, the pressure-gradient force, caused by air pressure differences, is pushing the air toward the center of the area of low pressure, and for various reasons is stronger then the Coriolis force. The face that the Coriolis force is zero at the equator and very week near the equator, explains why tropical cyclones such as hurricanes and typhoons won't form on the equator even though the other factors there, such as warm ocean water, would make them likely. Understanding the Coriolis force is difficult, in addition to the material on Alistair Fraser's Coriolis FAQ, you'll find a different way of looking at things by going to the Rotating Frames of Reference in Space and on Earth section of NASA's From Stargazers to Starships Web book. www.usatoday.com /weather/resources/basics/coriolis-understanding.htm   (544 words)

 Session 4: Coriolis Force   (Site not responding. Last check: 2007-10-21) Coriolis Force (C) The Coriolis force is caused by the Earth's rotation around its axis. So the Coriolis force is not a real force, but an apparent force due to the earth's rotation and our point of view. The Coriolis force is always directed 90° to the right of the direction of motion (see diagram). san.hufs.ac.kr /~gwlee/session4/coriolis.html   (408 words)

 The Coriolis Force, explained and debunked The Coriolis force (named for G.G. Coriolis, who discovered the force in 1835), like centrifugal force, is something of a pseudo-force in that it has no source. The force that actually changed your direction of motion was the friction between your pants and the top of the second hand, but all the while your momentum (inertia) was trying to keep you moving in a straight line. To understand the Coriolis force, it's easiest to think of yourself as being on the interior ring of a merry-go-round (moving counter-clockwise, say) while trying to throw a ball to your friend on the outermost ring. www.suite101.com /article.cfm/astronomy/24987   (526 words)

 Rotating Space Station Dynamics   (Site not responding. Last check: 2007-10-21) The Earth rotates relatively slowly and the Coriolis Effect is not observable except in global size movements such as the circulation of the ocean waters or the movement of air in weather systems. The coriolis force is always perpendicular the the direction of motion (velocity) of the ball and the axis of rotation of the station. As the ball 'falls' in the artifically gravity due to the centrifugal force, its velocity will be away from the center of the space station and the coriolis force will be in the opposite direction. www.go.ednet.ns.ca /~larry/physics/coriolis.html   (1219 words)

 [No title]   (Site not responding. Last check: 2007-10-21) Pushing is a simple form of a force, direction of acceleration depends on direction of the force exerted. Coriolis Force -- describes an apparent force that is due to the rotation of the earth. Thus the pressure gradient force is balanced by friction and Coriolis force. cimss.ssec.wisc.edu /wxwise/class/forcwind.html   (621 words)

 Urban Legends Reference Pages: Science (Flush Bosh) The twisting effect of the Coriolis force is real and does influence certain large things like the movement of air masses, but the effect is so small that it plays no role in determining the direction in which water rotates as it exits from a draining sink or toilet. The configuration of taps and drains is responsible for the direction of spin given to water draining from sinks and bathtubs to a degree that overwhelms the slight influence of the Coriolis force. The belief that the Coriolis force influences the direction in which water drains from plumbing fixtures is widespread and has been repeated as fact in a number of venues, including popular television shows (such as world traveler Michael Palin's Pole to Pole) and even in textbooks. www.snopes.com /science/coriolis.htm   (507 words)

 Coriolis force --  Encyclopædia Britannica Coriolis showed that, if the ordinary Newtonian laws of motion of bodies are to be used in a rotating frame of reference, an inertial force—acting to the right of the direction of body motion for counterclockwise rotation of the reference… any force invoked by an observer to maintain the validity of Isaac Newton's second law of motion in a reference frame that is rotating or otherwise accelerating at a constant rate. Armed Forces Day is celebrated on the third Saturday in May. Holidays by the same name have been celebrated in Benin, Rwanda, Chile, the Democratic Republic of... www.britannica.com /eb/article-9026305?tocId=9026305   (770 words)

 Coriolis Force   (Site not responding. Last check: 2007-10-21) an apparent force that is due to the rotation of the earth force increases from a value of zero at the equator (no Coriolis force) to a maximum at the north and south poles. Coriolis force acts at right angles to the wind, only influencing wind direction. www.cord.edu /faculty/ritchiso/exam3/tsld014.htm   (78 words)

 Inwit Publishing, Inc. and Inwit, LLC -- Writings, Links and Software Demonstrations - The Coriolis Force   (Site not responding. Last check: 2007-10-21) The Coriolis force on a 2-ton racing car going due north at 350 mph at a latitude of 45 degrees N is about 3.5 pounds. The Coriolis force due to the earth's rotation continuously nudges the pendulum to swing in a new plane. The Coriolis force is the only fictitious force which is dependent on the motion of the body with respect to the non-inertial frame. www.algorithm.com /inwit/writings/coriolisforce.html   (4137 words)

 Coriolis effect : Coriolis force   (Site not responding. Last check: 2007-10-21) If you are in the moving coordinate system this deviation makes it look like a force is acting upon the object (due to Newton's laws of motion), but actually there is no real force acting on the object, the effect is due to the motion of the coordinate system itself. Winds are affected by rotation of the Earth so that instead of a wind blowing perpendicular to the pressure isobars that cause it, it turns to the right of that direction in the northern hemisphere, and left in the southern hemisphere. This formula means that the force will be proportional to the velocity of the object and the rotation of the coordinate system. www.eurofreehost.com /co/Coriolis_force.html   (341 words)

 Coriolis effect : Coriolis force   (Site not responding. Last check: 2007-10-21) The Coriolis force plays a strong role in weather patterns, where it affects prevailing winds and the rotation of storms, and in the direction of oceanic currents. The Coriolis effect must also be considered in astrophysics, and stellar dynamics[?], where it affects phenomena such as the rotational direction of sunspots. The flight paths of airplanes, artillery shells, and missiles must account for the Coriolis effect or risk being off course by significant amounts. www.eurofreehost.com /co/Coriolis_force_2.html   (376 words)

 Coriolis   (Site not responding. Last check: 2007-10-21) Coriolis studied mechanics and engineering mathematics, in particular friction, hydraulics, machine performance and ergonomics. Coriolis began developing his ideas in 1819 and he showed some papers to Poncelet in 1824. In 1835 Coriolis wrote on a mathematical theory of billiards in Théorie mathématique des effets du jeu de billiard. www-groups.dcs.st-andrews.ac.uk /~history/Mathematicians/Coriolis.html   (824 words)

 Coriolis Force   (Site not responding. Last check: 2007-10-21) The Coriolis force is unique because it is an "apparent" force: it is only apparent to anyone on a rotating reference frame. We can summarize the effect on the Earth's rotation by noting that the Coriolis force causes moving air to be deflected to the right in the Northern Hemisphere and to the left in the Southern Hemisphere. A special note.* Since it should be obvious that the Coriolis force only has an effect on the motion of fluids if the fluids move over a great distance or move for a significant amount of time, there is no way that the Coriolis force can affect the direction of water flowing down a drain. www.cimms.ou.edu /~cortinas/1014/l21_1.html   (688 words)

 BBC - h2g2 - Coriolis Force - a Convenient Fiction - A593273 The Coriolis force is a theoretical force used to account for the odd behaviour of objects which move far enough in rotating frames of reference. The Coriolis effect - which the Coriolis force is often used to account for - is named after Gustave Gaspard Coriolis (1792-1843), the French mathematician and physicist who first described it in 1835 in a paper entitled On the Equations of Relative Motion of a System of Bodies. Coriolis force is as the title says, a convenient fiction. www.bbc.co.uk /dna/h2g2/alabaster/A593273   (1299 words)

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