Re: What is Forced (accelerated) Motion?

From: Alex Hunsley (lard_at_tardis.ed.ac.molar.uk)
Date: 07/21/04 

Date: Wed, 21 Jul 2004 00:50:02 GMT

Spaceman wrote:

> "Herman Family" <celcaps@frontiernets.net/without_any_s/> wrote in message
> news:ixiLc.468$gY4.403@news01.roc.ny...
> } The acceleration would be the angular velocity, squared, divided by the
> } radius, or 6.28 ft * 100 radians * 100 radians = 62800ft/sec^2 towards the
> } center of the disk.
>
>
> Why do use the term "towards the center of the disk?
> It is spinning constantly "around" it and never heading "towards" it,
> and also it does not accelerate at all.
> So why bother saying it is accelerating at all?
> It isn't.
> It is in a constant circular motion,
> no acceleration of it's speed is occuring at all,
> or the rpm would be rising along with the travel speed around
> the disk.

You misunderstand the use of acceleration here. What is being said is
that all points on the disk (except the central point) are in
acceleration when the disk is spinning, since they are changing their
velocity constantly. Any point has constant *speed*, but not velocity
(which has a direction). And a change in velocity is acceleration.

alex

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