On Fri, 7 Aug 2015 13:05:20 -0700 (PDT)
Alastair wrote:

On Friday, 7 August 2015 19:51:32 UTC+1, Graham P Davis wrote:

Oh! So you mean the centrifugal force does exist?


No, it doesn't.
http://scienceworld.wolfram.com/phys...ugalForce.html
https://en.wikipedia.org/wiki/Centrifugal_force
http://www.physicsclassroom.com/clas...rbidden-F-Word

--
Graham P Davis, Bracknell, Berks. [Retd meteorologist/programmer]
http://www.scarlet-jade.com/
I wear the cheese. It does not wear me.
Posted with Claws: http://www.claws-mail.org/

Does that mean you agree with me that cold radiation can/does exist?

Of course not. It reminds me of a factitious character from my old home
of Rushden Who was known as Professor Cloddy Darklight who got his name
from inventing dark light. The intention of this invention wasso that
he would be able to plunge a naturally-lit area into darkness. The
professor simply painted a light-bulb black and so, when it was
switched on, the darkness emitted by the bulb, if of high enough
wattage, would overwhelm any other source of light.

In Rushden, when anyone did something silly, they would say they had
done a Cloddy. One that has stuck in my mind was when I was a child
and, one evening, I saw my mother carrying a milk bottle up the stairs.
I asked here what she was doing and she looked at the bottle and said,
Oh, I've done a Cloddy!" She'd gone to the front door with a milk
bottle and hot-water bottle - one of the old stone ones, which I still
have somewhere - and she'd put the hot-water bottle on the doorstep
instead of the milk-bottle.

By the way, I seem to have done a bit of a Cloddy here in misspelling
"fictitious" but after my spell-checker accepted it, I followed up on
it and it seems the wrong word might also be right. OK, I confess
I'd not knowingly heard of "factitious" before.


However, I can't agree with you that the centrifugal force does not
exist :-( As I wrote in my previous post, if there were no
centrifugal force opposing the (centripetal) force of gravity, then
Earth would be pulled straight down towards the Sun. Newton's third
law states that every force has an equal and opposite force. In the
case of the Earth's orbit, the gravitational force is opposed by the
equal and opposite centrifugal force, fictitious or not.

It's not a case of you not agreeing with me, which is not important,
but you're not agreeing with any scientist or even anyone who learned
any science at school. I suggest you read the content in the links I
provided.

The centripetal force, which in the case of the Sun and Earth is their
gravitational attraction, is what keeps the Earth in orbit around the
Sun. If the centripetal force were really equally balanced by this
fictitious centrifugal force the Earth would fly off at a tangent as
there'd be no force to keep it moving in a circle.


But, let's not fall out about it :-)


Indeed not.

--
Graham P Davis, Bracknell, Berks. [Retd meteorologist/programmer]
http://www.scarlet-jade.com/
I wear the cheese. It does not wear me.
Posted with Claws: http://www.claws-mail.org/