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	The Path and Range of a Baseball - Air Friction
		Air friction is a fairly easy concept to grasp, but lets start with friction in general.
		Friction is another force not unlike the force exerted on the ball by the bat.
		Friction is a force which opposes the force moving an object.
	library.thinkquest.org /11902/physics/air.html (347 words)

	Air Friction
		Air friction, or air drag, is an example of fluid friction.
		For higher velocites and larger objects the frictional drag is approximately proportional to the square of the velocity:
		The resistance to an object's motion through a fluid may be termed "fluid friction." It may take the form of viscous resistance in a liquid, or the rather different character of air friction when an object moves through a gas.
	hyperphysics.phy-astr.gsu.edu /hbase/airfri.html (0 words)

	Animation Math in Lingo - Tutorial & Demos: Friction
		Due to air friction, the motion is similar to a feather or a snowflake.
		The type of behavior that air friction causes is useful in animation, because it is a general way of limiting the velocity of an accelerating object, even though you may not be trying to imitate an object moving through air.
		This friction still resists an object's motion, but it acts differently depending on whether the object is stationary or moving, called "static friction" and "kinetic friction".
	www.jmckell.com /friction.html (0 words)

	Heat generating apparatus and its process utilizing air circulation and convection - Patent 4426793
		This invention relates to a heat generating apparatus and its process utilizing air circulation and convection, wherein a chamber having air friction heat generating means is provided with outer air induction means and air flow therewithin is circulated forcibly as convective flow, thereby the temperature distribution becoming uniform throughout the interior of the chamber.
		The air pressure within the chamber 1 is gradually reduced since air therewith is suctioned forcibly and discharged outside the chamber 1 by rotation of the plurality of vanes 6.
		Thus, the air migrates forcibly back into the friction heat generating area A. The air is again heated by rotation of the rotary vanes 6 of the friction heat generating area A and discharged into the interior of the chamber by the rotary impeller 7.
	www.freepatentsonline.com /4426793.html (2749 words)

	HighBeam Encyclopedia - atmosphere
		The air also carries many kinds of dust, of meteoric as well as terrestrial origin, and microorganisms, pollen, salt particles, and various gaseous and solid impurities resulting from human activity (see pollution).
		The air in the troposphere is in constant motion, with both horizontal and vertical air currents (see wind).
		Meteors strike the thermosphere and mesosphere and burn from the heat generated by air friction.
	www.encyclopedia.com /html/a/atmosphe.asp (952 words)

	THE IMPORTANCE OF FRICTION (Site not responding. Last check: )
		Since the air is forced to slow down, the wind energy is transformed into heat or mechanical energy (primarily mechanical energy in meteorology).
		When friction forces the wind to slow down, the energy used to slow down the wind is transformed into mechanical energy which (blows tree limbs around, creates ocean waves, blows leaves about, supplies a pressure on objects at the earth's surface).
		It is surface friction that causes the phenomenon of "gusty winds" at the surface.
	www.theweatherprediction.com /habyhints/10 (413 words)

	Aquaculture dictionary - Aquatext - F
		Air is also sometimes used to assist in the fluidising process, especially where water velocities are too low to obtain sufficient fluidising.
		Air diffusion is often used to fluidise these filters rather than water.
		Friction loss is also sometimes called headloss or pressure loss, as it has the effect of reducing the amount of head (or pressure) of the water.
	www.pisces-aqua.co.uk /aquatext/list-f.htm (4558 words)

	Nelson Air - Air Bearing Primer
		Air bearings also offer much higher stiffness than rolling element bearings because the air film fully supports the components, as opposed to balls or rollers which have point or line contact and are therefore limited due to Hertzian contact stiffness.
		What this means for air bearings is that although they have a lower load capacity, gas bearings have essentially zero friction at all speeds and because the tight bearing clearances demand high accuracy components this results in extremely high accuracy motion.
		Air bearings can be used without any preload (such as a simple flat pad riding on a granite surface), however, in order to maximize the stiffness of the air bearing and help maintain constant air gap it is typical to preload it using one of four basic methods:
	www.nelsonair.com /NA_primer.htm (2219 words)

	Air Resistance
		Whenever the surfaces of two objects rub together, a friction force is generated that acts on both objects and opposes their relative motion.
		When the fluid in question is air, the friction force generated is called air resistance or wind resistance.
		Friction forces in general, and air resistance forces in particular, are very complex.
	www.batesville.k12.in.us /physics/PhyNet/Mechanics/Newton2/air_resistance.htm (439 words)

	Air Friction
		FRICTION In meteorology, it is the turbulent resistance of the earth on the atmosphere
		The amount of air friction or fluid friction depends on the speed and the shape of a moving object.
		AIR FRICTION is a recording in the classical ambient tradition, as defined by the work of Brian Eno and Erik Satie?s musique d?ameublement...
	www.feckfriction.com /airfriction (828 words)

	Types of Forces
		The friction force is the force exerted by a surface as an object moves across it or makes an effort to move across it.
		Friction results from the two surfaces being pressed together closely, causing intermolecular attractive forces between molecules of different surfaces.
		As such, friction depends upon the nature of the two surfaces and upon the degree to which they are pressed together.
	www.glenbrook.k12.il.us /gbssci/phys/Class/newtlaws/u2l2b.html (1110 words)

	Air Powered Rockets
		The mass of the ejected air times the speed of the ejected air is equal to the mass of the rocket times its speed.
		Friction is typically a speed dependent force so that higher speeds lead to higher frictional forces.
		These motors are used to help the very heavy space shuttle near the flight's beginning when air friction is the strongest and the earth exerts a large gravitational pull trying to bring the big ship back to the ground.
	cosmology.berkeley.edu /Education/DEMOS/Air_Rockets/Rocket_Supplemental.html (1706 words)

	Air Resistance and Shape
		Even surfaces parallel to the direction of motion of the object generate friction since molecules of air collide with the surface and are so pushed in the forward direction by the collision.
		That air has mass, and once it is moving, it often zings off in some direction as a little gust of wind.
		It is no different with the force of air, or the friction caused by air, it is dependant on area.
	www.newton.dep.anl.gov /askasci/eng99/eng99362.htm (701 words)

	Shoot the Cow!
		Friction "eats away" at the projectile's total energy as time goes on, which is why the trajectory looks a bit warped.
		In this case the force of friction is proportional to the velocity and is always pointing in the opposite direction of the motion.
		However, since the projectile is flying through air, friction causes the curve to droop over, with the projectile making less and less progress during each moment in time.
	zebu.uoregon.edu /~dmason/fnal/kaboom/xplaina.cgi (1370 words)

	Robert Scott Thompson - Air Friction
		While this project is somewhat similar to the ambient/space music RST is best known for of late, Air Friction presents lighter, more celestial ambient music and is a great introduction to his darker and more complex ambient music and also to his pop works.
		Air Friction is animated music with a fresh improvisatory spirit and a true artistic statement which further defines the ever-changing musical persona of Robert Scott Thompson.
		Air Friction is available on CD and what a great release it is. The music is a drifting, meandering collage of synthesized sounds a la Brian Eno which creates a very subtle but always interesting background of beautiful sounds.
	www.aucourantrecords.com /aurec/airfriction.htm (0 words)

	Friction
		Absent friction, the bottom plate of the levitator would continue rising closer and closer to the underside of the table.
		Further complicating the picture is that the physics of air friction change markedly for various values of the Reynolds number.
		The dynamic viscosity of air at 20 degrees C is about 1.8 e-5 kg/m-s and that of water at the same temperature is about 1 e-3 kg/m-s.
	www.seykota.com /rm/friction/friction.htm (1312 words)

	Physics 128 Lecture: Friction and Free-body Diagrams
		The direction of the kinetic frictional force is opposite the direction of motion of the object it acts on.
		The frictional force is nearly independent of the contact area between the objects.
		While the locomotive's force on the car is equal and opposite to the car's force on the locomotive the frictional force between the locomotive and the track is greater than the frictional force between the coal car and the track allowing them to move forward.
	www.cord.edu /dept/physics/p128/lecture99_12.html (0 words)

	Friction free air actuators, linear drives, linear actuators - Isotech
		The Del-Tron® Straight Line Design makes possible the low stiction and friction characteristics Del-Trons are known for, unlike recirculating designs in which the rolling elements must turn corners and often slide against each other as they travel.
		Airpot Pneumatic Actuators are ultra low friction devices designed to provide precise, repeatable motion at very high or low speeds without seals or lubrication.
		The basic construction consists of a graphitized carbon piston, precision ground to millionths of an inch TIR, inside an annealed, borosilicate glass cylinder with a precision fire polished bore.
	www.isotechinc.com /prod09.htm (267 words)

	Terminal velocity experiments (Site not responding. Last check: )
		Controls allow gravity, air friction and the mass and size of the ball to be varied.
		(Air friction in this simulation increases proprotionally to the surface area of the ball and also to the square of its velocity.
		The air friction control varies the constant of proportionality.
	www.materialworlds.com /sims/TerminalVelocity/worksheets.html (558 words)

	Team Friction (Site not responding. Last check: )
		Friction is often overlooked in our daily lives, but for athletes heading to Athens for the summer Olympics, too much or too little friction could be the difference between coming home with a medal or returning empty-handed.
		Friction is a resistance to motion opposite to the direction of travel when two surfaces—such as the bicyclist and air—are in contact, and it acts to slow a moving object.
		The force is due to friction between the air and the exposed surfaces of the rider and bicycle.
	www.chemistry.org /portal/a/c/s/1/feature_tea.html?id=c373e9fca141de598f6a4fd8fe800100 (488 words)

	Air Resistence - High School Online Collaborative Writing
		Air friction, or air drag, is a type of fluid friction.
		Unlike surface frictions experienced on land, Air friction forces are dependent on velocity, becoming larger as the velocity increases.
		For high velocites and larger objects the frictional drag is approximately proportional to the square of the velocity.
	schools.wikia.com /wiki/Air_Resistence (354 words)

	Team Friction (Site not responding. Last check: )
		Friction is often overlooked in our daily lives, but for athletes heading to Athens for the summer Olympics, too much or too little friction could be the difference between coming home with a medal or returning empty-handed.
		Friction is a resistance to motion opposite to the direction of travel when two surfaces—such as the bicyclist and air—are in contact, and it acts to slow a moving object.
		The force is due to friction between the air and the exposed surfaces of the rider and bicycle.
	www.acs.org /portal/a/c/s/1/feature_tea.html?id=c373e9fca141de598f6a4fd8fe800100 (480 words)

	Heat Shield Heating: Friction or Compression
		For example, the energy of each of the molecules in a table, in the air, and in a glass of water that are in a room are about the same, on the average.
		The fast-moving air that is flowing or impinging on the surface is being slowed down or brought to rest.
		Air is not a perfect fluid, but has some viscosity, and heat is generated as the kinetic energy is dissipated as the air is suddenly being slowed.
	www.newton.dep.anl.gov /askasci/eng99/eng99485.htm (475 words)

	MachineDesign.com: "Air" on the side of smoothness (Site not responding. Last check: )
		Air bearings are another option, though they have had a reputation for being expensive, delicate, and suitable only for laboratory test rigs.
		Air bearings excel in applications requiring tight velocity control such as scanning and wafer inspection, because they eliminate force ripples from recirculating ball bearings loading and unloading.
		Increasing load to 200 lb and compresses the air gap to 200 µin., further restricting flow and boosting average pressure to 40 psi.
	www.machinedesign.com /asp/viewSelectedArticle.asp?strArticleId=55726&strSite=MDSite&Screen=ARCHIVE (1182 words)

	Concept Engineering Group
		All of the energy and momentum of this air moving at approximately 1200 mph is focused onto the soil dislodging it in a fraction of a second.
		Air hoses must also be rated for the elevated pressure and are subject to greater working stress.
		Friction loss is proportional to the length of the hose.
	www.air-spade.com /technology.html (2861 words)

	The Airplane-Treadmill Conundrum - Pogue’s Posts - Technology - New York Times Blog
		For air to flow over the wings, the absolute prequisite for flight to occur, there must be motion relative to the air, not simply the wheels moving.
		Lift is generated by all the air flowing around the wing as it passes through the air, not merely by the air sucked in and expelled by the engines.
		Simple frictional forces do not vary by velocity (other than in the case of v=0 and v>0), so unless there is something about the chemical composition of these wheels that cuases the coefficient of friction in the bearings to increase with the rotational speed of the wheels, the treadmill supposed in this question cannot exist.
	pogue.blogs.nytimes.com /2006/12/11/the-airplane-treadmill-conundrum (14701 words)

	Your Ultimate Online Mousetrap Cars and Vehicles Help Guide (Site not responding. Last check: )
		Friction is a force that always opposes motion in a direction that is opposite to the motion of the object.
		A ball falling through the air is affected by fluid friction and a block sliding on a table is mainly affected by surface friction as well as a little air resistance.
		The amount of air friction or fluid friction depends on the speed and the shape of a moving object.
	www.mousetrap-vehicles.com /article.cfm?article_id=15 (1277 words)

	More About Adventures in Skydiving- Notes (Site not responding. Last check: )
		But this is because of differences in the amount of friction between these objects and the air around them, not because their masses are different.
		Drag – the friction between an object and a fluid, such as air, that it is moving through – is a force that acts opposite to the direction that the object is moving, slowing it down.
		Where f is the force of friction, µ is the coefficient of friction and N is the normal force.
	www.seed.slb.com /en/scictr/notes/sky_gui.htm (1713 words)

	Calculating Rolling Resistence - GameDev.Net Discussion Forums
		By "rolling resistance", I assume you mean friction, which is a force in the opposite direction to the velocity and centred on the point of contact between the two objects.
		The magnitude is relative to the velocity of the objects and the coefficient of friction of the two objects.
		where v is the actual speed of the object and k is the air friction coefficient (again depending on two factors, the mediun, like air or any gas mixture, and the shape of the corpse).
	www.gamedev.net /community/forums/topic.asp?topic_id=94383 (682 words)

	Furnace and Air Conditioner Filters - Replacement HVAC
		Installation of high-quality air filters is perhaps the single most effective strategy for improving indoor air quality and minimizing operation costs.
		Deciding on the appropriate air filters for your HVAC involves a balanced consideration of all of the factors of your individual circumstances.
		is an industry standard rating for air filters that measures its ability to trap particles ranging in size from 3 to 10 microns.
	www.global-filter.com (0 words)

	Bicycle Speed And Power Calculator
		The rolling frictions of the front and rear wheel tires each are taken into account separately.
		The air drag share of the bicycles themselves is taken into account too.
		At low speeds a wider tire (less rolling friction) may be advantageous while, with higher velocity, a narrower one (less air resistance) increasingly gets the upper hand.
	www.kreuzotter.de /english/espeed.htm (0 words)

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