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Topic: Fictitious force

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	Fictitious force - Definition, explanation
		By general agreement, the mechanical force exerted by the engine of the car is called a force, and the manifestation of inertia, the 'being pushed into the seat', is not categorized as a force.
		In the case of human scale setups, this centripetal force is provided in the form of mechanical force: a cord under tension, or friction between the surface of the disk an the object (or observer) on the disk.
		Whenever the expression 'fictitious force' is encountered in a text, it must be kept in mind that it refers to manifestation of inertia.
	www.calsky.com /lexikon/en/txt/f/fi/fictitious_force.php (2149 words)

	Fictitious force - Wikipedia, the free encyclopedia
		A fictitious force is a force used to explain acceleration in a non-inertial frame of reference, such as a rotating frame.
		The effect of a fictitious force is inferred to explain the accelerations observed in the non-inertial frame.
		Another fictitious force that arises in the case of circular motion is the Coriolis force, which is ordinarily visible only in very large-scale motion like the projectile motion of long-range guns or the circulation of the earth's atmosphere.
	en.wikipedia.org /wiki/Fictitious_force (1945 words)

	Centrifugal force - Wikipedia, the free encyclopedia
		The reactive centrifugal force is the reaction to the centripetal force.
		This is equal in magnitude to the centripetal force, directed away from the center of rotation, and is exerted by the rotating object upon the object which exerts the centripetal force.
		Similarly, the potential energy of the centrifugal force is often used in the calculation of the height of the tides on the Earth (where the centrifugal force is included to account for the rotation of the Earth around the Earth-Moon center of mass).
	en.wikipedia.org /wiki/Centrifugal_force (1650 words)

	Centrifugal force Summary
		The reactive centrifugal force is the reaction to the centripetal force [1].
		This is equal in magnitude to the centripetal force, directed away from the center of rotation, and is exerted by the rotating object upon the object which exerts the centripetal force.
		Similarly, the potential energy of the centrifugal force is often used in the calculation of the height of the tides on the Earth (where the centrifugal force is included to account for the rotation of the Earth around the Earth-Moon center of mass).
	www.bookrags.com /Centrifugal_force (2067 words)

	Situations
		The direction of the frictional force on the portion of the wheel contacting the ground is opposite to the direction of the velocity of this portion of the wheel with respect to the ground.
		This force and the gravitational force acting on the ball compress the ball.
		The forces on the object as it descends are the force of gravity and the support from the track.
	electron9.phys.utk.edu /phys135d/modules/m6/situations.htm (2874 words)

	Reference.com/Encyclopedia/Fictitious force
		By general agreement, the mechanical force exerted by the engine of the car is called a force, and the manifestation of inertia, the 'being pushed into the seat', is not categorized as a force.
		In the case of human scale setups, this centripetal force is provided in the form of mechanical force: a cord under tension, or friction between the surface of the disk an the object (or observer) on the disk.
		Whenever the expression 'fictitious force' is encountered in a text, it must be kept in mind that it refers to manifestation of inertia.
	www.reference.com /browse/wiki/Fictitious_force (2155 words)

	Fictitious Forces (Site not responding. Last check: 2007-10-09)
		They invent a fictitious force to explain the cause and it feels like you are thrown forward when you are really tugged backwards.
		As in all cases involving force and acceleration, there are a pair of equal and opposite forces acting.
		From the specific reference frame inside the car, centrifugal force exists as a fictitious force which appears to try to eject you from the car as the door pushes on you to counteract your inertial tendency to keep moving in a straight line at a constant speed.
	home.honolulu.hawaii.edu /~rickb/SciColumns/FictForce.04Feb96.html (460 words)

	Inertial force - basic notions.nb
		It is hence equally true to say that the sum of external forces is equal to the inertial force of the particle, as it is 'resisting' the change in motion imposed by external forces.
		An observer scientist observes in case a) that the mass m is accelerating negatively along its primed x-axis with a magnitude of -x''[t], and concludes the existence of a fictitious force F'x operating on the particle m.
		Moreover the term 'fictitious' shoud be used solely to describe the type of inertial forces introduced by the acceleration/rotation of the noninertial reference frame itself and not be used as being equivalent to 'inertial'.
	www.angelfire.com /realm/moetown/mandrin/golf/Centrifugal_forces_basics.html (2107 words)

	One Minute Papers - Centrifuges and Roller Coasters
		And because it experiences a fictitious force in the direction opposite its acceleration, it experiences an outward fictitious force away from the center of the circle.
		The fictitious force is truly fictional; a way of talking about the strange pull you feel toward the outside of the loop.
		The force from the ball on the bat also doesn't cause the bat to vibrate, because the sweet spot is a vibrational node.
	galileo.phys.virginia.edu /classes/105N/1995/omp/centrifuges_and_roller_coasters.htm (1579 words)

	Exam 2
		your velocity is away from the center of the merry-go-round and you experience a fictitious force in the direction of your velocity.
		you are accelerating away from the center of the merry-go-round and experience a fictitious force in the direction of your acceleration.
		Why: A fictitious force downward is due to acceleration upward, which in turn is due to a net force upward.
	www.holycross.edu /departments/physics/troach/HTW/Spring2001/Exam2/Exam2-01solns.htm (2647 words)

	Does centrifugal force hold the Moon up?
		Such a mass-dependent force is an indicator that something is not right--we have chosen to use a noninertial frame, and if we demand Newton's laws to hold in such a frame, then we'll have to invoke this fictitious force.
		Centrifugal force is such a fictitious force, invented purely to balance the books, when we analyse a situation in a rotating frame.
		But it's a sort of "higher order" fictitious force when compared to the everyday one we experience in a bus: unlike the very uniform force that pushes us forward in a braking bus, gravity can't be made to completely vanish by a simple change of frame.
	math.ucr.edu /home/baez/physics/General/Centrifugal/centri.html (1942 words)

	Fictitious Forces (Site not responding. Last check: 2007-10-09)
		They invent a fictitious force to explain the cause and it feels like you are thrown forward when you are really tugged backwards.
		As in all cases involving force and acceleration, there are a pair of equal and opposite forces acting.
		From the specific reference frame inside the car, centrifugal force exists as a fictitious force which appears to try to eject you from the car as the door pushes on you to counteract your inertial tendency to keep moving in a straight line at a constant speed.
	www.hcc.hawaii.edu /~rickb/SciColumns/FictForce.04Feb96.html (460 words)

	Force (Site not responding. Last check: 2007-10-09)
		However, scientists consider there to be only 4 fundamental forces of nature, with which every observed phenomenon can be explained: the strong nuclear force, the electromagnetic force, the weak nuclear force, and the gravitational force.
		The former three forces have been accurately modeled using quantum field theory, but a successful theory of quantum gravity has not been developed, although it is described accurately on large scales by general relativity.
		The magnitude of the resultant varies from zero to the sum of the magnitudes of the two forces, depending on the angle between their lines of action.
	www.free-download-soft.com /info/force.html (1727 words)

	Re: question on how to kick yourself to center of merry go round.
		They are only called fictitious because these forces have no obvious cause, and they result from an accelerating observer attempting to apply Newton's Laws as if the observer were not accelerating.
		One fictitious force which we are going to negate is the Coriolis force.
		The second form of the centrifugal force is more convenient since the angular speed of the merry-go-round is constant in time and does not change as the rider changes distance from the center.
	www.madsci.org /posts/archives/2002-12/1040612058.Ph.r.html (1015 words)

	Centripetal Force (Site not responding. Last check: 2007-10-09)
		It should not be confused with centrifugal force, a fictitious force from the center.
		Centrifugal force is a fictitious force because it does not exist, though sometimes you feel sure it does exist.
		This force is provided by the person next to him who finds it harder and harder to keep his grip on the last person as they go faster and faster.
	www.newton.dep.anl.gov /askasci/phy00/phy00349.htm (428 words)

	Midterm Exam - Answers
		This motion is uniform circular motion and you are experiencing a centripetal force (a force toward the center of the circle).
		Why: Since the force of gravity on an object is proportional to that object's mass, increasing the mass increases the force of gravity on it.
		As your leg lifts you upward, the force it exerts upward is your weight and the distance it moves you upward is the height of the platform.
	rabi.phys.virginia.edu /105/1995/midterm_answers.htm (5205 words)

	ipedia.com: Coriolis effect Article (Site not responding. Last check: 2007-10-09)
		This equation means that the force will be proportional to the velocity of the object and the rotation of the coordinate system.
		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.
		Here, an approximate balance between pressure gradient force and Coriolis force exists, causing the geostrophic wind, which is the wind effected by these two forces only, to blow along isobars (along lines of constant geopotential height, to be precise).
	www.ipedia.com /coriolis_effect.html (999 words)

	Waves
		In general, the centripetal force that needs to be applied to an object of mass m that is traveling in a circular path of radius r at a constant velocity v is.
		While centripetal force is a real force,-that is, the force is due to the influence of some object or field-centrifugal force is a fictitious force.
		In general, real forces are present regardless of whether the reference frame used is accelerating or not accelerating; fictitious forces are present only in an accelerating frame of reference.
	www.harwich.edu /depts/hhssail/waves.html (537 words)

	Straight Dope Staff Report: Why does spinning a space station create artificial gravity?
		Since the only force on you is from the moving air (which we'll ignore), you just keep on floating there, in the same position relative to the outside inertial frame.
		The force is being exerted on you by the floor (outer rim) of the space station, which is pushing on the soles of your feet.
		Whereas real forces are always exerted by something, fictitious forces are not: They're just there, as a consequence of the frame you're in.
	www.straightdope.com /mailbag/martificialgravity.html (1069 words)

	Inwit Publishing, Inc. and Inwit, LLC -- Writings, Links and Software Demonstrations - The Coriolis Force (Site not responding. Last check: 2007-10-09)
		Gravity is an attraction between all matter particles; the electromagnetic force is mediated by photons; and the strong and weak nuclear forces are mediated by even more obscure particles (one of which is called the "gluon").
		The apparent force is a consequence of your motion in an accelerating reference frame.
		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)

	Fictitious Forces
		This mutual pair of forces, one pushing forward on one object (the person), and the other backward on the other object (the car), is what the person inside the car feels.
		The answer lies in the Force Law, which specifies that the acceleration which an object receives depends not only on the force acting on it, but also on its own mass, or inertia, or resistance to a change in its motion.
		For real forces, there is no guarantee that the force acting on the object and the mass of the object will produce a particular acceleration.
	cseligman.com /text/physics/fictitious.htm (2272 words)

	physics central physics in action - Blowin' in the wind - page 1 (Site not responding. Last check: 2007-10-09)
		The Coriolis force is a “fictitious” force, unrelated to interactions between particles or between particles and radiation.
		The Coriolis force is included in Newton’s Second Law (F=ma) to account for the acceleration of Earth’s frame of reference.
		The Coriolis force is also responsible for bending the paths of hurricanes, typhoons and cyclones in opposite directions in the northern and southern hemispheres, as shown on the map.
	www.physicscentral.com /action/action-05-04b.html (375 words)

	Bad Coriolis FAQ
		It is correct that the Coriolis force causes a moving object to experience a force to the right (left) of its path in the northern (southern) hemisphere.
		But it is slightly over balanced by the pressure gradient force (pgf) which points toward the center of the low (the imbalance is what causes the fluid to move along a curved path).
		If the Coriolis force were to be disqualified owing to its inability to do work, it would take a number of other well established forces along with it into oblivion.
	www.ems.psu.edu /~fraser/Bad/BadFAQ/BadCoriolisFAQ.html (2581 words)

	STREPULSION-Physics
		When Newton applied Gravitational force to the SUN also, then, to counterbalance Solar Gravitational force (So as Planets should not collide upon the Sun by Solar Gravitation) - Newton compelled to create the fictitious anti-gravitational (Off-Centre Force) force beneath the title of ASTRONOMICAL CENTRIFUGAL FORCE - to be exerted by Planetary bodies.
		That is to say, intensity of Centrifugal force is so high that it neutralises gravitational intensity of both units that is of the Sun and Planets.
		The very funny side of this puzzle is SGF and ACF both forces are fictitious force imagined/created to counterbalance each other.
	www.strepulsion.com /1c.htm (672 words)

	Scigolf Presents Jack Kuykendall's Myths of Golf - #2 - The Scientific Explanation of Centrifugal Force
		The only force pulling on the ball is that of the string, pulling toward the center of the circle - a CENTRIPETAL force.
		The water goes through the holes at a tangent to the tub, while the clothes are moved inward in a circle.
		The centrifugal force is a fictitious force introduced to describe motion in a rotating, and therefore noninertial, reference frame."
	www.scigolf.com /scigolf/myths/myth2.htm (572 words)

	Can Fictitious Force Become Real ???
		Centrifugal force is considered as a fictitious force.
		I don't think anyone, whether in an inertial frame or not, would ever see a fictious force becoming 'real'; after all, if there is an agent causing the force in one frame, that agent will have to be present in all other frames.
		This can account for fictitious centrifugal acceleration as real outward spiral repulsive force of antigravity and also defines a new kind of mass as kinetic mass, a repulsive mass for antigravity.
	www.physicsforums.com /showthread.php?t=33699 (1011 words)

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