# Centrifugal force

Why is centrifugal force called pseudoforce ? ?

 sunand_k Posts: 1, Reputation: 1 New Member #2 Jan 6, 2003, 12:14 AM
Re: centrifugal force
Hey pal, that's a nice one. U know that `CF' is dependant on the circular velocity of a body and the higher the velocity or `smaller the radius of motion' the laqrger is the CF. It is not a force caused by a fixed constant, like `g' for example which identifies the force by a mass.
 binod_dhungana Posts: 3, Reputation: 1 New Member #3 Jan 7, 2003, 04:15 AM
Re: centrifugal force
Quote:
 author=binod_dhungana link=board=physics;num=1041688528;start=0#0 date=01/04/03 at 08:55:28]Why is centrifugal force called pseudoforce ? ?
yes, but will you make more easy to understand?
 sclark Posts: 17, Reputation: 1 New Member #4 Jan 14, 2003, 09:54 PM
Re: centrifugal force
Quote:
 author=sunand_k link=board=physics;num=1041688528;start=0#1 date=01/06/03 at 00:14:40]It is not a force caused by a fixed constant, like `g' for example which identifies the force by a mass.
Also, because the reference point for the centrifugal pseudoforce is usually taken to be inside a moving object (the water in a bucket, the people in a rollercoaster cart) the frame of reference mistakenly refers to a force as though they are in an inertial state. However, the force is caused by the acceleration of the frame rather than as an external force on the body.
 CommDweeb Posts: 11, Reputation: 5 New Member #5 Mar 3, 2003, 06:34 PM
Re: centrifugal force
I think this is what you were asking for.

One of the laws of motion says that "For every action there is an equal and opposite reaction." A force is often refered to as an action. A reaction is sometimes called a pseudo force. Centrifugal Force is actually a reaction to the Centripital Force that keeps the object going in a circle. This makes it a pseudo force.

Another way to look at it is to consider the case that you are swinging a bucket of water arround. You are acting on the water and the bucket. You are pulling on the rope to keep the bucket and water from flying off. Lets call this the Acting Force. The bucket and water are reacting to this Acting Force with an equal and oposite Reacting Force. This is centrifugal force and is sometimes called a pseudo force because it is a reaction, and not an action.

I hope this helps
 Dr._Ephemeron Posts: 22, Reputation: 1 New Member #6 Jun 29, 2003, 03:50 PM
Re: centrifugal force
CommDweeb is right.

Centrifugal force is represented by a force vector from the center of rotation (or instant center of rotation) toward a mass body.

There is actually no force in that direction from a frame of reference outside of the body, their is only a centripetal force from the mass body toward the center (or instant center) of rotation.

In other words if you are in a spinning barrel and stick to the wall, there is no centrifugal force pushing you against the side of the barrel, their is centripital force from the side of the barrel pushing on you.

I know this is hard to understand, but remember acceleration is produced by a change in velocity or a change in direction (or a combination of both). When you are in a spinning barrel, the sides of the barrel are continually changing your direction because a body in motion always wants to travel in a straight line. So you tend to want to keep moving in a line that is tangent to the side of the barrel, but the barrel keeps turning you. The acceleration from the side of the barrel changing your direction produces centripital force. This force is normal to the barrel and since their is a friction between you and the barrel, you "stick" to the sides.

Here is a stoy that always makes me chuckle: A college professer was once asked why a satellite orbits the earth and he replied because the centrifigul force pushing on the satellite is equal to the force of gravity pulling on the satellite. Therefore it keeps going around in a circle.

Now since the sum of the forces equals the mass of the satellite x acceleration and all the forces on the satellite are equal to zero means we either have no acceleration or the satelite has no mass.

Well the satellite has mass, so that rules that out.

If their is no acceleration, than the body would be still or moving in a straight line with a constant velocity.

Since it is moving in an orbit their must be acceleration, so this means that their can't be equal an opposing forces on the satellite!

In fact their is only one force on the satellite, centripetal force due to gravity.
 eskyler Posts: 1, Reputation: 1 New Member #7 Jan 13, 2005, 11:25 PM
Centrifugal acceleration/Reaction force is real.
Hello:
May I join in this discussion of centrifugal force?
Binod_dhungana wrote Why is centrifugal force called pseudoforce ? ?

Good question. A force is a push or a pull experienced by an object. Forces are invisible but often measurable by scale. An action force causes or is capable of causing the action of acceleration. A reaction force is caused by an action force and therefore is never the cause of any event. It merely exists to support the acceleration/Action force that represents its cause. These reaction-to-acceleration forces are always reactively generated internally within each accelerating component of an object's matter. For this reason I refer to them as internal forces. In circular events, the inward force is always the acceleration/Action force. It is inward-directed and thus is termed centripetal. It's LAW III support force is the accelerating object's own internal acceleration/Reaction force. It is always outward-directed and thus is termed centrifugal.

Understand what many do not. No force can ever exist alone. No centripetal acceleration/Action force can ever exist without the immediate presence of an equal and opposite centrifugal acceleration/Reaction support force. This centrifugal reaction force is often measureably present.

For example, Dr._Ephemeron predicts in his spinning barrel event that the centripetal (acceleration/Action) force is pushing inward on you without the presence of a centrifugal (acceleration/Reaction) force from your body reactively pushing outward on the barrel. Yet everyone including D._Ephemeron recognizes that the pressure between contacting object is always mutual as in equal and opposite at the point(s) of contact. So if centripetal force is pushing inwards against you, what else should we call but centrifugal the equal and opposite force that is pushing outward against the barrel. Insert a compression scale between your body and the barrel wall and the force reading on the scale displays the truth of what I say. Trying to make sense of this accelerational event by denying the existance of the reaction force is just not right.

Many of us do not understand the activity of acceleration, nor the supporting role acceleration/Reaction forces play. In an effort to understand, often the outward-directed acceleration/Reaction force known as centrifugal is mistakenly described as a "pseudo" force. In truth it is a real internal reaction force that is always present in every event involving centripetal acceleration.

Hope this helps.,

Ethan Skyler

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