Re: Confusion redux: "Centrifugal Force"


"Henri Wilson" <HW@..> wrote in message
news:v0fvl2t1j3jh2sckgk5kuqaija9i7rhkpi@xxxxxxxxxx
| On Sat, 18 Nov 2006 23:24:53 GMT, "Sorcerer"
<Headmaster@xxxxxxxxxxxxxxxxxx>
| wrote:
|
| >
| >"Mike" <eleatis@xxxxxxxx> wrote in message
| >news:1163886273.245138.253960@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
| >|
| >| Henri Wilson wrote:
| >|
| >| [snip]
| >|
| >|
| >| > However, as Mike has been somewhat ineffectively pointing out, the
| >rotating
| >| > frame concept itself implies the existence of centrifugal forces as a
| >| > prerequisite.
| >| >
| >|
| >| Ok, I'm tired repeating myself about this. Of course, the assumption
| >| that there is a frame in which the ball is at rest implies immediatelly
| >| a real centrifugal force.
| >
| >Henri didn't say anything about being at rest in the rotating frame.
| >Perhaps other people are tired of you snipping. Repeat yourself.
| >[snip]
|
| The ball IS at rest in the rotating frame.

http://www.accucadd.com/DefaultPage/CRWNPINI.GIF
What is the centrifugal/centripetal force on the axle?

http://mathworld.wolfram.com/images/gifs/cycloid.gif

What is the direction of motion where the tyre, at rest, meets the road?



LAW I.
Every body perseveres in its state of rest, or of uniform motion in a right
line, unless it is compelled to change that state by forces impressed
thereon.--Newton

LAW II.
The alteration of motion is ever proportional to the motive force impressed;
and is made in the direction of the right line in which that force is
impressed.--Newton

LAW III.
To every action there is always opposed an equal reaction; or the mutual
actions of two bodies upon each other are always equal, and directed to
contrary parts. --Newton.



Write laws for rotating frames, Wilson. We'll call them "Wilson's Laws" (if
accepted).

Androcles.

It's a good thing radio/electronic/mechanical/software/civil engineers
understand physics, 'cos domestic physicists sure don't.






.

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