Re: acceleration

[Brian Whatcott <betwys1@SBCGLOBAL.NET>]

At 04:52 PM 11/19/2003,  Matt Jusinski, you wrote:

[J Denker]
> > In my book, there is such a thing as scalar
> > acceleration
> > which means an increase in speed (|v|).

> If the scalar acceleration is zero locally, and the
> speed is locally zero, Why does a projectile fall back
> down?
>
> It seems to me that scalar acceleration is not much
> help in explaining most common phenomenon.
>
>
> Matt Jusinski  Morris Hills Regional District


Yes, Matt is using a short-hand, but still, a nit-pick.
To abstract the thought:
"If a [math construct] is zero, why does a physical
effect happen?"
...Because, the models of schoolmasters do not control
reality. One can hope they illuminate aspects of reality,
 is all - and accept their sphere of influence - never
 universal.