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Topic: Air resistance

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	Encyclopedia: Air resistance
		Wind resistance is a layman's term used to describe drag.
		Physics stubs Atmospheric drag is a form of drag, which is the force that opposes an object moving through a liquid or gas.
		A Drag Resistant Aerospike is a telescoping outward extension that reduces frontal drag on missiles.
	www.nationmaster.com /encyclopedia/Air-resistance (788 words)

	Air
		Air also carries tiny particles of solid material such as dust, but the water and the solid particles are not considered part of the air.
		The gases in air are nitrogen (78%) and oxygen (21%) The remaining 1% of air consists almost entirely of the gas argon.
		The air moves constantly because of the motion of the earth, the gravitational attraction of the moon and sun, the heating of the sun and the vibration or movement of molecules of the gases that make up the air.
	www.studyworld.com /basementpapers/papers/stack13_1.html (610 words)

	ESPN SportsFigure - Interactive Zone Results
		In the simplest model of air resistance, we find that the force due to the air is proportional to the square of the velocity of the object traveling through the air.
		The force of air resistance is also dependent on the surface area of the moving object.
		There are other factors that affect air resistance including the density of the air (a function of the temperature), the shape of the object, and the texture of the object.
	sportsfigures.espn.com /sportsfigures/lp_terminal_velocity.jsp?iAm=null (724 words)

	The Physics Classroom
		Air resistance is the result of collisions of the object's leading surface with air molecules.
		The two most common factors which have a direct effect upon the amount of air resistance present are the speed of the object and the cross-sectional area of the object.
		In situations in which there is air resistance, massive objects fall faster than less massive objects.
	www.physicsclassroom.com /Class/newtlaws/U2L3e.html (966 words)

	Air Pressure and Resistance
		Recently, I had said that the air resistance acting on a falling object is actually the air pressure that is acting on the object.
		Air resistance is due to the motion of an object through the air.
		Air pressure may be viewed as part of why air resistance exists, but it is not air resistance itself.
	www.newton.dep.anl.gov /askasci/phy00/phy00427.htm (1063 words)

	Effect of texture on air resistance (Site not responding. Last check: 2007-11-07)
		The reaction force of the surface on the air tends to make the air close to the surface move in the direction of motion of the surface, so that the air at the surface acts like it "sticks" to the surface.
		The layer of the air between the surface and the still air is called the boundary layer.
		The air that encounters a seam is made turbulent, and the boundary layer can travel farther around behind the ball than the boundary layer air on the other side.
	carini.physics.indiana.edu /E105/texture.html (1448 words)

	The Physics Classroom
		Suppose also that air resistance could be eliminated such that neither the elephant nor the feather would experience any air drag during the course of their fall.
		The motion of the elephant and the feather in the absence of air resistance is shown.
		In the absence of air resistance, both the elephant and the feather are in a state of free-fall.
	www.physicsclassroom.com /mmedia/newtlaws/efff.html (843 words)

	Elephant and Feather (Air Resistance)
		The motion of the elephant and the feather in the presence of air resistance is shown.
		Subsequently, the amount of air resistance is dependent upon the speed of the falling object and the surface area of the falling object.
		Once the upward force of air resistance upon an object is large enough to balance the downward force of gravity, the object is said to have reached a terminal velocity.
	www.glenbrook.k12.il.us /gbssci/phys/mmedia/newtlaws/efar.html (1239 words)

	Free Fall Explained
		Objects which are said to be undergoing free-fall, are not encountering a significant force of air resistance; they are falling under the sole influence of gravity.
		The actual amount of air resistance encountered by the object is dependent upon a variety of factors.
		To keep the topic simple, it can be said that the two most common factors which have a direct effect upon the amount of air resistance are the speed of the object and the cross-sectional area of the object.
	www.geocities.com /Athens/Academy/9208/u2l3e.html (988 words)

	Free Fall and Air Resistance
		The ratio of force to mass (Fnet/m) is the same for the elephant and the mouse under situations involving free fall; this ratio (Fnet/m) is equivalent to the acceleration of the object.
		In situations in which there is air resistance, more massive objects fall faster than less massive objects.
		A falling object will continue to accelerate to higher speeds until they encounter an amount of air resistance which is equal to their weight.
	www.glenbrook.k12.il.us /gbssci/phys/Class/newtlaws/u2l3e.html (900 words)

	Air Friction
		Air friction, or air drag, is an example of fluid friction.
		is the air density, A the crosssectional area, and C is a numerical drag coefficient.
		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 (359 words)

	Science Forums and Debate - Air resistance
		air resistance is the friction force exerted on the motion of an object in air and increases with speed.
		Yes, though their final speeds would be different if both had the same shape, since the force of gravity depends on mass, but the force of drag depends on surface area and velocity.
		Doesn't air resistance depend on the action-reaction force by the object to the air molecules?
	www.scienceforums.net /forums/printthread.php?t=7085 (1435 words)

	Projectile Motion and Air Resistance
		Resistance proportional to the square of the velocity yields
		Assume that air resistance is proportional to the velocity, e.g.
		Assume that air resistance is proportional to the square of the velocity, e.g.
	math.fullerton.edu /mathews/N310/projects/p6.htm (323 words)

	Air Resistance (Site not responding. Last check: 2007-11-07)
		When the fluid in question is air, the friction force generated is called air resistance or wind resistance.
		The relationship between air resistance force and velocity is not simple, but certainly more velocity means more force.
		The exact relationship between shape and air resistance force is difficult to predict, however.
	www.batesville.k12.in.us /Physics/PhyNet/Mechanics/Newton2/air_resistance.htm (439 words)

	Air resistance (Site not responding. Last check: 2007-11-07)
		drag (or air resistance): the frictional force from the air that resists the forward motion of the object.
		You are probably aware that the air around us exerts a pressure on everything of 14.7 lb per square inch (about 100000 N per square meter, that's the weight of 10 tons on every square meter of surface).
		For a baseball (area of about 7 sq in), the air on one side of the ball exerts a force of about 100 lb into that side while ther air on the other side pushes with an equal force into the opposite side: there is no imbalance of the pressure force on the ball.
	carini.physics.indiana.edu /E105/drag-force.html (1526 words)

	Air Resistance in 1-D
		When a sphere the size of a baseball or golfball moves through air at a normal speed, momentum is transferred to it from the air with which it collides, i.e.
		The volume of air the ball sweeps through in one second is the product its velocity and cross-sectional area, so the momentum transferred will be this volume multiplied by the density of air, the velocity of the air relative to the ball, and a 'drag coefficient'.
		In terms of the terminal velocity, resistive force is weight multiplied by the square of the ratio of velocity to terminal velocity.
	www.kw.igs.net /~jackord/bp/f3.html (839 words)

	2.7.4 Air Resistance (including Porosity) (Site not responding. Last check: 2007-11-07)
		When air is passed, under pressure, from 1 side of a piece of paper to the other, it has to navigate the capillary air passages between the fibers.
		Air resistance, and its inverse property porosity (permeance, permeability), thus reflect the internal fibrous structure of paper.
		Air resistance indicates: the extent of refining; the likely absorption by a base paper of a coating or impregnant; the ease of filling a paper sack with cement; or the performance of a filter paper.
	www.paperloop.com /toolkit/paperhelp/2_7_4.shtml (285 words)

	Re: We have several questions regarding air resistance
		Air is a mixture of gases: primarily nitrogen and oxygen.
		Air is thin as compared to water, but their characteristics are similar.
		Example: As an airplane climbs the air density is reduced as function of altitude, and the drag force operating on the airplane is also reduced.
	www.madsci.org /posts/archives/apr2000/955503094.Ph.r.html (473 words)

	Tunturi fitness equipment
		The resistance is generated by adjusting the distance of the magnets to the flywheel: the closer to the flywheel the magnets are, the greater the resistance to the flywheel and cranks.
		Air resistance brake is used above all in heavy-duty rowers.
		By adjusting the tightness of the belt, the resistance is increased or reduced.
	www.tunturi.com /fitness/brake.cfm (363 words)

	Projectile Motion Activity
		By studying their motion and by constructing a model for the air resistance force it is possible to calculate the air resistance coefficient.
		In general, the resistance force due to solid-fluid interactions is assumed to depend on the velocity and geometry of the projectile in question.
		The air resistance is often assumed to be proportional to the projectile velocity when the projectile is moving slowly.
	www.esm.psu.edu /courses/emch12/intdyn/activities/kinetics_particle/proj-motion (1075 words)

	Air Resistance (Site not responding. Last check: 2007-11-07)
		He did state explicitly, though, that even for heavy materials, air resistance was important at the speeds attained by firearms (see the last three paragraphs of this—but can you spot a mistake in the third paragraph from the end?
		In practice, as Galileo understood, the air resistance to a falling object increases with speed.
		So he thought that since a ball of wood was more slowed in its fall by air resistance than a ball of lead of identical size and shape, the ball of wood must be experiencing a greater retarding force.
	landau1.phys.virginia.edu /classes/581/AirRes.html (459 words)

	ENGR 115 Lab Four
		Except in rare situations such as in space or in vacuum chambers, neglecting air resistance is an approximation.
		Air resistance is based on the cross-sectional area of the object normal to the direction of flight.
		If so we can "bundle" the area and the resistance factor into a single constant D. Even with this simplification, closed-form (easy to write) solution only exits by solving a differential equation because the resistance depends on the velocity and the velocity is in turn dependant on the resistance.
	faculty.rwu.edu /mstein/ENGR115/labs/lab4.html (821 words)

	Falling Body with Air Resistance
		We assume that there are two forces affecting the vertical descent of the object: gravity and air resistance.
		The force due to air resistance is proportional to the speed, and is applied in the direction opposite to motion.
		An alternative hypothesis is that the force due to air resistance is proportional to the square of the speed...this might be more reasonable, for example, at very high speeds.
	oregonstate.edu /instruct/mth252h/Bogley/w02/resist.html (1664 words)

	Projection without air resistance (Site not responding. Last check: 2007-11-07)
		The force impedes the resistance from lowering the velocity already attained, the resistance stops the force from increasing the velocity.
		of the resisting force and the distance, by which the mass is shifted by the performing force, is important.
		The work, which you required while tightening the string, is completely returned to it, in that it relaxes and gives the arrow a velocity, which enables it to do as much work as required to give the arrow its velocity.
	kr.cs.ait.ac.th /~radok/physics/a6.htm (4614 words)

	Physics (Site not responding. Last check: 2007-11-07)
		Air molecules collide with the body falling through the air causing friction and drag.
		The amount of air resistance is based on surface area and speed which are directly proportional to the amount of air resistance.
		Terminal velocity is when the force of air resistance is equal to the force of gravity.
	www.users.muohio.edu /mcgratra/physics.html (295 words)

	Resistance - Wikipedia, the free encyclopedia
		resistance to a disease (see related subject immunology)
		a political or military resistance movement against foreign occupation, or more rarely, against one's own government
		This is a disambiguation page — a list of articles associated with the same title.
	en.wikipedia.org /wiki/Resistance (88 words)

	Re: At what height is air resistance no longer negligable?
		Air is much less dense than water and Helium is even less dense than air.
		The resistance to motion is proportional to the frontal area of an object, the density of the fluid, the square of the velocity, and a factor known as the drag coefficient.
		Air resistance can be estimated using simple equations, but a wind tunnel is needed to measure resistance accurately.
	www.madsci.org /posts/archives/aug99/934466640.Ph.r.html (633 words)

	Read about Transport at WorldVillage Encyclopedia. Research Transport and learn about Transport here! (Site not responding. Last check: 2007-11-07)
		air traffic control, etc, as well as policies, such as how to
		communication, which is vital for advanced transportation systems, from railroads which want to run trains in two directions on a single track, to air traffic control which requires knowing the location of aircraft in the sky.
		Thus, it has been found that the increase of one generally leads to more of the other.
	encyclopedia.worldvillage.com /s/b/Transport (616 words)

	USATODAY.com - Scorching summers melting Italian resistance to air conditioning (Site not responding. Last check: 2007-11-07)
		With the air of self-appointed saviors, the first thing many Italians do when climbing aboard an air-conditioned city bus is open all the windows.
		Those who manufacture, install or sell air conditioners say the last few blistering summers — including this season's scorcher, Italy's hottest in some 50 years — have speeded up what had been a slow erosion of national bias against air conditioning.
		While much of northern Europe shrugs off air conditioning because hot weather there is usually brief, Italy, at the continent's southern end, seemed for generations to accept sweating through summers as a way of life.
	www.usatoday.com /weather/news/2003-08-15-italy-air-condit_x.htm (746 words)

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