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Topic: Friction

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dynamical friction

coefficient of friction

Rolling friction

Friction Baby

munter friction hitch

Side Friction roller coaster

Friction factor

double friction hitch

air friction

Kinetic friction

Friction blocks

friction knot

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	Friction Zone Magazine - Motorcycle Travel and Information
		Friction Zone is the only motorcycle magazine—print or internet-based—that includes official motorcycle accident reports.
		You can receive Friction Zone by mail by subscribing, or visit our distribution page to see where you can pick up your free copy each month.
		If you can't get Friction Zone at your local shop, either ask the dealer to stock it, or you can receive a year's subscription for only $30.
	www.friction-zone.com (854 words)

	Friction - MSN Encarta
		Friction, force that opposes the motion of an object when the object is in contact with another object or surface.
		Friction depends on this force because increasing the amount of force increases the amount of contact that the object has with the surface at the microscopic level.
		In this equation, F is the force of friction, µ is the coefficient of friction between the object and the surface, and N is the normal force.
	encarta.msn.com /encnet/refpages/RefArticle.aspx?refid=761569794 (1568 words)

	Friction - Wikipedia, the free encyclopedia
		Friction is the force that opposes the relative motion or tendency of such motion of two surfaces in contact.
		The coefficient of friction (also known as the frictional coefficient) is a dimensionless scalar value which describes the ratio of the force of friction between two bodies and the force pressing them together.
		Fluid friction is the friction between a solid object as it moves through a liquid or a gas.
	en.wikipedia.org /wiki/Friction (1530 words)

	Force
		Frictional resistance to the relative motion of two solid objects is usually proportional to the force which presses the surfaces together as well as the roughness of the surfaces.
		Friction is typically characterized by a coefficient of friction which is the ratio of the frictional resistance force to the normal force which presses the surfaces together.
		Frictional resistance forces are typically proportional to the force which presses the surfaces together.
	hyperphysics.phy-astr.gsu.edu /hbase/frict.html (734 words)

	friction. The Columbia Encyclopedia, Sixth Edition. 2001-05
		Friction does not depend on the amount of surface area in contact between the moving bodies or (within certain limits) on the relative speed of the bodies.
		The coefficient of friction is the quotient obtained by dividing the value of the force necessary to move one body over another at a constant speed by the weight of the body.
		Thus the coefficient of static friction (describing the former case) for a pair of substances is greater than the coefficient of kinetic friction (describing the latter case) for the substances.
	www.bartleby.com /65/fr/friction.html (561 words)

	rolling friction (Site not responding. Last check: )
		Friction is the resistance to the sliding, rolling, or flowing motion of an object due to its contact with another object.
		Zero friction occurs only for horizontal motion at constant velocity, but it is non-zero for any case in which acceleration is occurring parallel to the direction of motion of the center of mass, as when the object is rolling-without-slipping up or down a sloped surface.
		This resultant frictional force is still rearward acting (tending to contribute to the angular velocity), but the new distribution of the normal forces creates a net torque negating the rotational contribution of the friction and causing an overall deceleration of the wheel’s forward velocity.
	webphysics.davidson.edu /faculty/dmb/PY430/Friction/rolling.html (644 words)

	Sliding Friction
		The coefficient of static friction does not depend upon contact surface area, provided the two surfaces are made of dissimilar enough material so that any cohesive force between the two surfaces is small.
		The force of static friction (like the normal force) is a reaction force in that its value depends upon the magnitude of some external force trying to push the object along the surface.
		The coefficient of friction between the block and the incline plane, the applied force, the angle of the incline plane, and the mass of the block can be varied.
	www.ac.wwu.edu /~vawter/PhysicsNet/Topics/Dynamics/Forces/FrictionalForce.html (333 words)

	Friction (band) - Wikipedia, the free encyclopedia
		Friction (フリクション furikushon) is a Japanese underground rock band formed in 1978.
		Friction was formed by bassist and vocalist Reck in Tokyo, Japan in March 1978 after he returned from New York, where he played with Teenage Jesus and the Jerks and James Chance and The Contortions.
		Friction's third studio album, Replicant Walk, was released in June 1988.
	en.wikipedia.org /wiki/Friction_(band) (385 words)

	Coefficients Of Friction
		The coefficient of sliding friction is expressed using the same formula as the static coefficient and is generally lower than the static coefficient of friction..
		The coefficient of friction is required in calculating tightening torques and resulting bolt tensile forces and stress and in calculating the resulting friction between the connected surfaces.
		The coefficient of friction used for designing these types of connections is dependent on the interface pressure, materials, surface condition, surface coatings etc. The coefficient of friction is also dependent on the method of installation.
	www.roymech.co.uk /Useful_Tables/Tribology/co_of_frict.htm (1660 words)

	Friction
		Friction is obviously an important factor of cross country skiing.
		On one hand, friction is necessary because without it a skier wouldn't be able to ski up hill or even move on flat surfaces.
		As the skier overcomes the static friction there is a point where the coefficient of friction is greater than that of the kinetic friction that resists the skiers motion.
	ffden-2.phys.uaf.edu /211_fall2002.web.dir/Sarah_Schlichting/Friction.html (288 words)

	Forces 2 - Friction
		We can measure friction in terms of a coefficient of friction, this is the ratio of the force needed to move two objects in contact with one another and the force holding the two objects together.
		The degree of friction between two object is greatest when they are at rest (this is called the static friction or friction at rest).
		Once the object is moving the level of friction is reduced (this is called the kinetic friction or friction of motion).
	www.newi.ac.uk /buckleyc/forces2.htm (996 words)

	friction@Everything2.com
		The coefficient of kinetic friction is less then the coefficient of static friction.
		Thusfar, you might not like friction, since you've been wanting to move the salt and it's been stopping you, but once the salt reaches the end of its journey (in front of your mother), you'll be grateful friction is there.
		-- Friction primer, Friction tube, a tube used for firing cannon by means of the friction of a roughened wire in the friction powder or composition with which the tube is filled -- Friction wheel Mach., one of the wheels in frictional gearing.
	www.everything2.com /index.pl?node=friction (1719 words)

	Friction Stir Welding
		The friction heating generated at the interface softens both components, and when they become plasticised the interface material is extruded out of the edges of the joint so that clean material from each component is left along the original interface.
		Friction stir welding has been used to weld all wrought aluminium alloys, across the 2xxx, 5xxx, 6xxx and 7xxx series of alloys, some of which are bordering on being classed as virtually unweldable by fusion welding techniques.
		Friction stir welding has also been used to weld lightweight panels made of plastic foam sandwiched between two sheets of aluminium, for which any fusion welding technique would encounter serious problems because of the much higher temperatures involved.
	www.azom.com /details.asp?ArticleID=1170 (1357 words)

	Friction
		Friction is the force between surfaces in contact that resists their relative tangential motion.
		Dry friction is directly proportional to the normal force between the two surfaces in contact.
		Friction is largely independent of surface roughness (despite what you may have read in other textbooks).
	hypertextbook.com /physics/mechanics/friction (1169 words)

	Friction
		Friction, which is worse in vacuum, has caused irreversible failures in many space instruments.
		The first practical application of friction dates from nearly a million years ago, when it was discovered that heat from friction could be used to light a fire.
		In a simple case of friction, if we apply a force parallel to the surface, there is no motion until we exceed a minimum force, see the figure.
	www.virginia.edu /ep/SurfaceScience/friction.html (855 words)

	Sliding Block Tutorial (Site not responding. Last check: )
		The amount of acceleration is determined by acceleration due to gravity, the angle of the plane, and the coefficient of friction of the block with the plane.
		The coefficient of friction is a measure of the amount of friction that exists between two materials as one slides over the other.
		The coefficient of friction of skis on snow is 0.01; of brass on glass, 0.1; and of two hands rubbing together, 0.5.
	www.cs.utah.edu /~zachary/isp/applets/SlidingBlock/SlidingBlock.html (501 words)

	Friction
		The frictional force is the other component; it is in a direction parallel to the plane of the interface between objects.
		When a frictional force exists but there is no relative motion of the surfaces in contact (e.g., the book isn't sliding across the table), we call it a static frictional force.
		The coefficient of friction (static or kinetic) is a measure of how difficult it is to slide a material of one kind over another; the coefficient of friction applies to a pair of materials, and not simply to one object by itself.
	physics.bu.edu /~duffy/py105/Friction.html (1140 words)

	Physics & Biomechanics Glossary: Friction
		Friction is a force between an object and the ground, which always acts to oppose the motion of the object.
		For example, after a skater pushes against the ice and the ground reaction force causes him or her to glide forward, friction acts between the blade and the ice to slow the skater down.
		Since the skater slowly glides to a halt after pushing against the ice, we know that a force is opposing his or her motion causing him or her to slow down.
	btc.montana.edu /olympics/physbio/glossary/g09.html (212 words)

	GCSE Physics: Energy, Forces and Motion: Friction
		Friction makes this lorry difficult to move, but it does help by giving the man a good grip on the road.
		Friction can be a nuisance, because it changes kinetic energy into heat which is usually wasted.
		If it wasn't for friction between the tyres and the road, driving a car would be like trying to drive on an ice rink.
	www.darvill.clara.net /enforcemot/friction.htm (715 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 (546 words)

	Friction
		The coefficient of sliding friction for wood on wood is 0.4.
		The coefficient of static friction is 0.7 and the coefficient of sliding friction is 0.4.
		The kinetic force of friction is 40 lbs to the right, leaving a net force of 40 lbs to the left to accelerate the block to the left.
	webpages.charter.net /griche/pt/u4s1q.htm (1155 words)

	Summary of Friction (Site not responding. Last check: )
		The maximum force of static friction that exists between two surfaces is proportional to the normal force and mostly independent of area of contact.
		In general frictional forces are independent of the area of contact although this is an empirical observation not a theory.
		The reason that friction is nearly independent of surface area is if the "microscopic" area of contact of the brick to the table is independent of the orientation of the brick.
	zebu.uoregon.edu /1999/ph161/friction.html (508 words)

	Resistive Force of Friction - School for Champions: Succeed in Physical Science
		The requirement for friction is that the object must be in contact with another object or material and an external force must be applied on the object in an attempt to move it.
		The causes of sliding friction are surface roughness of the materials, molecular attraction or adhesion between the materials, and deformation resistance in the case of soft materials.
		Friction is a force that resist the motion of the object that is in contact with another object or material.
	www.school-for-champions.com /science/friction.htm (1390 words)

	friction
		Friction is what allows you to stay in control while skiing.
		Because friction is a force that opposes motion, it is the reason you slow down.
		In order to stop you use a lot of friction by applying the whole edge of your ski perpendicular to the direction of travel.
	ffden-2.phys.uaf.edu /211_fall2002.web.dir/brandon_locke/Webpage/friction.htm (107 words)

	Friction (Site not responding. Last check: )
		Friction is the resistance to motion of an object that slides or attempts to slide over a surface.
		The coefficient of friction is used to calculate the F
		It is a ratio of the magnitude of the force of friction, F
	www.rhhs.ca /new_page_80.htm (281 words)

	PHYSICS Master
		Static friction has a larger coefficient then kinetic friction That means that once an object has started to move, it takes less force to continue to make it move.
		Static friction will counteract the force attempting to move the object exactly until the limit is reached, which is the coefficient of static friction multiplied by the normal force.
		Suppose you have an object on an incline plane of 30 degrees that weighs 10 kg and that the coefficient of static friction is.4.
	library.thinkquest.org /TQ0312826/index.php?chapter=4&page=5 (395 words)

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