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Topic: Sliding friction

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Friction

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	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 /encyclopedia_761569794/Friction.html (1551 words)

	friction
		With a sudden change in sliding velocity, the coefficient of sliding friction exhibits an instantaneous change (an increase for an increase in velocity, and a decrease for a decrease in velocity).
		Frictional velocity dependence is the change in steady-state sliding friction coefficient with a change in sliding velocity.
		This work is motivated by: (1) a lack of laboratory friction data for materials that accurately represent natural faults, and (2) the need to understand the effect of factors such as compaction state, the presence of clays, changes in clay mineralogy, and normal stress on frictional behavior.
	www.geosc.psu.edu /~dsaffer/friction.html (1748 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 this model, the sliding friction force is that required to shear the "cold-welded" contacts.
	www.virginia.edu /ep/SurfaceScience/friction.html (855 words)

	Friction, Alaska Science Forum
		Sliding friction between the wheels and the pavement is the villain of the piece, while total rolling friction and starting friction allow the car to be controlled.
		The block will continue to slide, because sliding friction, the friction between two surfaces that are moving relative to each other, is always less than starting friction, the friction that must be overcome to start motion.
		If this effective rolling friction increases until it is greater than the starting friction, unpleasant things happen: as starting friction between the pavement and the wheels changes to sliding friction, which is always less than starting friction, the wheels begin to slide on the pavement.
	www.gi.alaska.edu /ScienceForum/ASF8/843.html (665 words)

	Friction Summary
		The reduction of friction that arises with motion is the result of fewer areas of contact once a body is in motion; the molecules are not in contact long enough to form firm bonds.
		Fluid friction is the friction between a solid object as it moves through a liquid or a gas.
		A common way to reduce friction is by using a lubricant, such as oil, that is placed between the two surfaces, often dramatically lessening the coefficient of friction.
	www.bookrags.com /Friction (2228 words)

	Sliding Block Tutorial (Site not responding. Last check: 2007-09-11)
		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 of skis on snow is 0.01; of brass on glass, 0.1; and of two hands rubbing together, 0.5.
		As it slides, the simulated distance that the block has moved is displayed in the lower-right corner, and the amount of simulated time that has passed is displayed at the top.
	www.cs.utah.edu /~zachary/isp/applets/SlidingBlock/SlidingBlock.html (501 words)

	Friction (Site not responding. Last check: 2007-09-11)
		This perpendicular force is known as the normal force and the ratio of the frictional force to the normal force is known as the coefficient of friction.
		Friction is used to slow and stop many amusement rides including rollercoasters and the free fall.
		Static friction prevents the motion of one object to the other until the applied force is greater than the static friction between them.
	library.thinkquest.org /2745/data/friction.htm (369 words)

	Sliding Friction, Laboratory Exercise
		An object which is made of wood, when sliding on another object of wood, has its motion retarded by a frictional force.
		We see the interesting result that the coefficient of friction can be measured in terms of the angle, and with no dependence upon the size and mass of the block itself.
		The static frictional forces are always larger than the kinetic frictional forces and not so reproducible, experimentally.
	www.pa.uky.edu /~phy211/Friction_book.html (356 words)

	Resistive Force of Friction - 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 (1418 words)

	Coefficient of Friction
		The reason for this is that the friction depends on many factors such as asperities, the mass of load, temperature, sliding speed, normal reaction, and the type of material.
		This third graph is the relationship for the coefficient of friction of various materials at different temperatutes with a fixed velocity (3.14m/s on the graph).
		The amount of surface area which is in contact with the ice directly affects the coefficient of friction; a greater surface area will increase the amount of contact area between the load and the ice, therefore, allowing the area of friction increase.
	www_hockey.tripod.com /ice/id5.html (1168 words)

	Coefficients Of Friction (Site not responding. Last check: 2007-09-11)
		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..
		Coefficients of friction are sensitive to atmospheric dust and humidity, oxide films, surface finish, velocity of sliding, temperature, vibration, and extent of contamination.
		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.
	www.roymech.co.uk /Useful_Tables/Tribology/co_of_frict.htm (1660 words)

	Friction
		Friction is a force (measured in Newtons) acting along the surfaces of two objects in physical contact that impedes the relative motion of these objects (the motion of one with respect to the other).
		Static friction: the frictional force that opposes any attempt to move a stationary object along a surface.
		Sliding friction: (sometimes called "kinetic" friction): this frictional force opposes the sliding motion of two surfaces rubbing together.
	www2.ignatius.edu /faculty/decarlo/friction3.htm (557 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.
		Another common type of friction is sliding friction, where one object slides on a surface.
	www.jmckell.com /friction.html (546 words)

	Static and Kinetic Friction (Site not responding. Last check: 2007-09-11)
		There is a limit to the magnitude of static friction, so eventually you may be able to apply a force larger than the maximum static force, and the box will move.
		Both static and kinetic friction depend on the surfaces of the box and the floor, and on how hard the box and floor are pressed together.
		While sliding, the only force acting on the block in the horizontal direction is that of friction.
	www.yhc.edu /external/hramm/214Lab4.PwC12.Friction.F02.htm (1912 words)

	Friction Block
		Sliding friction is caused by two factors, the roughness of the surfaces and the force that presses them together.
		The result is always a fraction or decimal between zero and one, known as the coefficient of friction, m.
		If you push or pull an object at constant speed as it slides over a surface, the applied force has to be equal to the force of friction.
	www.angelfire.com /stars/dhsphysics/friction.html (359 words)

	Gamasutra - Features - "Physics on the Back of a Cocktail Napkin" [05.16.00]
		Friction between the ball and the table causes this roll to occur.
		The friction force is gone since the point of contact is not moving relative to the table.
		It is important to note that the coefficients of rolling and sliding friction are not necessarily the same.
	www.gamasutra.com /features/20000516/lander_02.htm (1318 words)

	Inline Grip, Friction And Skating Force-- Speedskating Santa Barbara
		Sliding friction always involves power loss but there could be enough grip left to produce some power also.
		In sliding friction the molecules in the wheel's contact patch move along the ground when sliding sideways.
		Sliding friction is useful as an emergency measure (the hockey slide) but it is a power loss and is not usually involved in racing.
	home1.gte.net /pjbemail/GripFriction.html (1843 words)

	Friction at the nano-scale (February 2005) - Physics World - PhysicsWeb
		He found that the frictional force that resists the sliding motion between two interfaces is directly proportional to the perpendicular force that squeezes the surfaces together.
		Tabor ultimately became convinced that friction in the absence of wear - the tearing off of fragments along the sliding interface - must be due to the build up of strains between the interfaces that were then released in the form of atomic vibrations called phonons.
		A closely associated phenomenon is that of "stick-slip" friction, whereby the transition from static to sliding friction leads to repetitive sticking and slipping at certain speeds.
	physicsweb.org /articles/world/18/2/9 (2866 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)

	Friction - Wikipedia, the free encyclopedia
		A value of 0.0 would mean there is no friction at all, an illusive property as even Magnetic levitation vehicles have atmospheric friction.
		The drag of air on an airplane or of water on a swimmer are two examples of fluid friction.
		According to the law of conservation of energy, no energy is destroyed due to friction, though it may be lost to the system of concern.
	en.wikipedia.org /wiki/Friction (1752 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)

	Friction
		It is that threshold of motion which is characterized by the coefficient of static friction.
		When two surfaces are moving with respect to one another, the frictional resistance is almost constant over a wide range of low speeds, and in the standard model of friction the frictional force is described by the relationship below.
		The coefficient is typically less than the coefficient of static friction, reflecting the common experience that it is easier to keep something in motion across a horizontal surface than to start it in motion from rest.
	hyperphysics.phy-astr.gsu.edu /hbase/frict2.html (713 words)

	Friction (Site not responding. Last check: 2007-09-11)
		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)

	Friction
		There are times when you want lots of friction, between the soles of your shoes and the surface that you stand on, and there are times when you want as little as possible.
		Friction between solids, can be classified into two classes, sliding friction and rolling friction.
		Friction is a force that resists the motion of two objects that are in contact with each other.
	users.snip.net /~veraandscience/Work/Friction.html (1395 words)

	Slip-Slidin' Away
		A disk that's both sliding and spinning has a complicated pattern of velocity across its surface: the spin causes one side to move faster than the center of the disk, while the opposite side moves slower or in the opposite direction.
		The velocity pattern determines the total friction on the disk, which is not simply the sum of friction calculated separately for disks that were sliding or spinning only.
		Wolf and his colleagues prove that the coupling of the two forms of friction is such that all combinations of sliding and spinning converge to the same endpoint, with both motions ceasing at the same time.
	focus.aps.org /story/v11/st26 (567 words)

	Static versus Sliding Friction, Alaska Science Forum (Site not responding. Last check: 2007-09-11)
		If we were to tie a string to a block of wood resting on a table, we would probably have to pull on the string with a force roughly half the weight of the block to get it to move.
		This is equivalent to saying that the coefficient of sliding friction between the block and the table is only about 0.2.
		In other words, once something has begun to slide, the friction between the two surfaces is not nearly so great as it was when it was at rest.
	www.gi.alaska.edu /ScienceForum/ASF5/534.html (350 words)

	Measuring Friction
		Friction is the resistance offered to the one body past another body with which it is in contact.The amount of friction depends on the nature of the contact surfaces and the magnitude of the force pressing the two together.
		And FLUID friction is the friction between fluids and a solid.
		The coefficient of Friction of wood sliding on wood is between 0.25 and 0.50.
	www.stemnet.nf.ca /d6vsatf2000/s1/Project4/index.html (622 words)

	Sliding friction - Wikipedia, the free encyclopedia
		Sliding friction is when two solid surfaces slide against each other.
		Putting a book flat on a desk and moving it around is an example of sliding friction.
		Sliding friction is very effective at opposing the movement of an objects and is the force that causes the object to stop moving.
	en.wikipedia.org /wiki/Sliding_friction (138 words)

	Sliding Friction - Makeup Lab (Site not responding. Last check: 2007-09-11)
		The purpose of this lab is to analyze the relationships between the variables associated with the frictional forces acting upon a skidding automobile.
		Near the bottom of the monitor are three input fields for entering values for the mass, speed, and the coefficient of friction for a car which is braking to a stop.
		Does the relationship between coefficient of friction and skidding distance (Part 5) appear to be linear to the -1 power or linear to the -2 power?________________ To find out, use the Graphical Analysis program (on the school's server) to plot distance vs. coefficient of friction (coefficient of friction is plotted along the horizontal axis).
	www.glenbrook.k12.il.us /gbssci/phys/makeups/forces/u2l4.html (1103 words)

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