Re: What is Forced (accelerated) Motion?
From: Van Jacques (calccurve-test23_at_yahoo.com)
Date: 07/21/04
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Date: 20 Jul 2004 19:43:14 -0700
Spaceman wrote:
> "Alex Hunsley" <lard@tardis.ed.ac.molar.uk> wrote in message
> news:_4jLc.86783$q8.8405@fe1.news.blueyonder.co.uk...
> } 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.
>
> That is where you are losing the original "real world" meaning
> of acceleration (speeding up)
Wrong. This is where _you_ are going wrong. Take some time
to read about these things. Its not that difficult.
> A change in direction does not automaticall infer a change in
velocity,
> for if it did, the disk would be speeding up it's speed according to
> the old fashion meaning of acceleration.
>
> If I asked to to accelerate the point on the disk,
> Would you speed up the disk, or tell me it is already accelerating,
> constantly?
> The mathematical world definition is very bad,
You can't change the definitions of words to suit your ideas.
You don't understand circular motion. Any motion that is not
both 1) a straight line
2) constant speed
does not have constant velocity, and it takes acceleration to
change velocity. If all motion were in 1D--on a line, you would
be right. But a circle is in 2D, and allows for changes in direction.
This is the 1st place where things start to get interesting.
> The mathematical world definition is very bad,
No. Your post shows why we need that precision of math in
our definitions. It keeps us from getting confused about
things. Math is about precision of ideas, and using logic,
at least I think that is the aspect that is relevant here.
Van
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