Subject:
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Re: "real" LEGO Hovercraft ? (with/without batteries/RCX "onboard")
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Newsgroups:
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lugnet.robotics
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Date:
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Sat, 30 Nov 2002 02:58:55 GMT
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Original-From:
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Jim Choate <RAVAGE@EINSTEIN.antispamSSZ.COM>
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Viewed:
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1300 times
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On Fri, 29 Nov 2002, Steve Baker wrote:
> Jim Choate wrote:
>
> > You're in an elevator. The elevator goes down. Your weight decreases but
> > your mass does not.
>
> And if we were talking about a hovercraft in an elevator - I'd be
> agreeing with you.
We're not talking about hovercraft here at -all-. We -are- talking about
the assertion that 'mass is equivalent to weight on the planet Earth'. It
isn't, ever. A vector is -never- equivalent to a scalar, basic
dimensional analysis; basic physics.
Your engaging in a logical strawman using an ad hominim to intimidate
(three different logical fallacies) isn't helpfull at all. That you don't
see the importance of the distinction is of no interest to me. If you
don't want help, so be it.
Q: If mass and weight are equal why does it take so much to get the hover
off the ground, but so little to move it horizontally? It's not pedantic
at all. Lifting the hover is working -against- gravity, moving the hover
laterally is independent of gravity outside of frictional issues (which
the air bearing the skirt provides is minimal). It's understanding the
subtleties of nature and working -with- them to build a working device.
I can suggest for those with interest in logical fallacies a good
reference. Appendix A (pp 275) covers all 26 types of logical fallacies
and how to spot them.
The Art of Science
A practical guide to experiments, observations, and handling data
J.J. Carr
ISBN 1-878707-05-1
$20 US
Ta ta, color me Casper on this topic...
--
____________________________________________________________________
We don't see things as they are, ravage@ssz.com
we see them as we are. www.ssz.com
jchoate@open-forge.org
Anais Nin www.open-forge.org
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