Centrifugal Force

[Born2bwire]

Originally posted by: TitanDiddly

Originally posted by: Howard
LOL

Originally posted by: TitanDiddly

Huh? In order for a body to move in a circle, there must be a radial acceleration. Acceleration comes from force. How can it not exist? If centripetal force didn't exist, things would indeed fly off in straight lines.

The force keeping the body on the rotating object is a normal force- a seat, a chain, whatever. It is pushing you away from your normal path- a straight line. Similar to if you were walking in a straight line, and someone shoved you off to the side. They shoved you with a force, moving you. You shoved back exactly as hard, your momentum being the source of that force. You are correct in calling it an acceleration. Your acceleration(assuming constant angular velocity) is constantly directly towards the center of rotation.

Exactly, that's centripetal force.

I love that comic though I probably should feel a bit saddened by being able to understand the jokes.

Hmmm... Text

 

[dullard]

Ahh the joy of so many misguided souls arguing over a catch phrase that they treat as the gospel truth. There isn't anything else quite like it.

The whole "centrifugal forces don't exist" lie needs to end. Are you trying to say that no where in the universe has a force ever been applied away from the center of any object for any reason? Man, what a strange world that would be.

Can you pick up a pebble from a pile of rocks? NO! You cannot pull away from the center of a pile! What are you a moron thinking you can pick something up? Can an explosion inside a sealed container break that container? NO! Forces cannot exert pressure to the outside, so of course no container can ever break from an internal explosion.

Need I go on?

If you have a ball on a string and you spin around, the ball feels a centripetal force. Sit there and be smug about being correct when looking at the ball only. But guess what? There are more things in the world than that ball. Look at yourself? The ball is pulling away from you. It is pulling away from the center of you. Gasp! An apparent centrifugal force is exerted on you. Your physics teacher was correct that the ball doesn't feel a centrifugal force. But your physics teacher forgot about the rest of the universe.

 

[Trevelyan]

Originally posted by: FoBoT
:laugh:

this one is about ATOT

http://xkcd.com/c202.html

:laugh:

Haha youtube comments are EXACTLY like that too. I love the American bashing one.. haha!

 

[Trevelyan]

Originally posted by: dullard
An apparent centrifugal force is exerted on you. Your physics teacher was correct that the ball doesn't feel a centrifugal force. But your physics teacher forgot about the rest of the universe.

Umm... no he didn't. All he said is that the object going in a circle is only acted on by two forces: gravity and the string it is attached to. From this perspective, which is usually the most useful one to analyze, the force is centripetal.

I don't think anyone was saying anything more than that.

 

[randay]

Sorry, I'm not into Pokemon.

 

[dullard]

Originally posted by: Trevelyan
Umm... no he didn't. All he said is that the object going in a circle is only acted on by two forces: gravity and the string it is attached to. From this perspective, which is usually the most useful one to analyze, the force is centripetal.

I don't think anyone was saying anything more than that.

For the ball, it is centripetal. But in their zeal to correct people on the ball, they tend to lie and say that centrifugal forces don't exist. You don't think anyone was saying that? Well:

Originally posted by: Op's comic strip
There's no such thing as a centrifugal force.

Originally posted by: bobert
hehe i remember my physics teacher telling me that centrifugal forcers are fake

Originally posted by: TitanDiddly
Neither centrifugal nor centripital forces exist.

Originally posted by: Fenixgoon
it's centrifugal that doesn't exist.

And ~200,000 links on one search phrase all related to the same lie.

So don't tell me that no one is saying that.

 

[beemercer]

Funny site .

 

[TitanDiddly]

Originally posted by: dullard

Originally posted by: Trevelyan
Umm... no he didn't. All he said is that the object going in a circle is only acted on by two forces: gravity and the string it is attached to. From this perspective, which is usually the most useful one to analyze, the force is centripetal.

I don't think anyone was saying anything more than that.

For the ball, it is centripetal. But in their zeal to correct people on the ball, they tend to lie and say that centrifugal forces don't exist. You don't think anyone was saying that? Well:

Originally posted by: Op's comic strip
There's no such thing as a centrifugal force.

Originally posted by: bobert
hehe i remember my physics teacher telling me that centrifugal forcers are fake

Originally posted by: TitanDiddly
Neither centrifugal nor centripital forces exist.

Originally posted by: Fenixgoon
it's centrifugal that doesn't exist.

And ~200,000 links on one search phrase all related to the same lie.

So don't tell me that no one is saying that.

It's not a force, it's an acceleration. Big difference.

 

[mugs]

Originally posted by: Scarpozzi

Originally posted by: Howard

Originally posted by: TitanDiddly

Originally posted by: Howard
LOL

Originally posted by: TitanDiddly

Huh? In order for a body to move in a circle, there must be a radial acceleration. Acceleration comes from force. How can it not exist? If centripetal force didn't exist, things would indeed fly off in straight lines.

The force keeping the body on the rotating object is a normal force- a seat, a chain, whatever. It is pushing you away from your normal path- a straight line. Similar to if you were walking in a straight line, and someone shoved you off to the side. They shoved you with a force, moving you. You shoved back exactly as hard, your momentum being the source of that force. You are correct in calling it an acceleration. Your acceleration(assuming constant angular velocity) is constantly directly towards the center of rotation.

So why doesn't centripetal force exist, again?

I wouldn't know...I was out on the town with a bunch of WOMEN when these guys were reading about it.

You can be smart and get laid. It's unfortunate that you had to settle for one or the other.

 

[91TTZ]

If you really think about it, both centrifugal and centripetal forces are just other forces rebranded to apply to spinning things.

 

[Born2bwire]

Originally posted by: TitanDiddly

Originally posted by: dullard

Originally posted by: Trevelyan
Umm... no he didn't. All he said is that the object going in a circle is only acted on by two forces: gravity and the string it is attached to. From this perspective, which is usually the most useful one to analyze, the force is centripetal.

I don't think anyone was saying anything more than that.

For the ball, it is centripetal. But in their zeal to correct people on the ball, they tend to lie and say that centrifugal forces don't exist. You don't think anyone was saying that? Well:

Originally posted by: Op's comic strip
There's no such thing as a centrifugal force.

Originally posted by: bobert
hehe i remember my physics teacher telling me that centrifugal forcers are fake

Originally posted by: TitanDiddly
Neither centrifugal nor centripital forces exist.

Originally posted by: Fenixgoon
it's centrifugal that doesn't exist.

And ~200,000 links on one search phrase all related to the same lie.

So don't tell me that no one is saying that.

It's not a force, it's an acceleration. Big difference.

It's an acceleration of a mass, that is force. The rotating object experiences centripetal force, the object that is pulling on the rotating object experiences centrifugal force.

 

[dullard]

Originally posted by: Born2bwire

Originally posted by: TitanDiddly

Originally posted by: dullard
If you have a ball on a string and you spin around...

It's not a force, it's an acceleration. Big difference.

It's an acceleration of a mass, that is force. The rotating object experiences centripetal force, the object that is pulling on the rotating object experiences centrifugal force.

The object that TitanDiddly's balls rotate around has no mass. . Thus in his very unusual circumstance, acceleration would require no force.

 

[Random Variable]

The centrifugal force (like the Coriolis force) is a fictitious force in that it is only experienced by someone in a rotating reference frame and that is not the result of interacting bodies. To call it completely fictitious is a falshehood. The force itself is equal to -m?X(?Xr')

 

[Fiveohhh]

Straight from wikipedia. Short and easy to comprehend.

"A real or "reactive" centrifugal force occurs in reaction to a centripetal acceleration acting on a mass. This centrifugal force 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 imposes the centripetal acceleration."