OT: Speed of light [was Re: Why not a Python compiler?]
Jeff Schwab
jeff at schwabcenter.com
Mon Feb 11 18:06:05 EST 2008
Erik Max Francis wrote:
> Jeff Schwab wrote:
>
>> Erik Max Francis wrote:
>>> Robert Bossy wrote:
>>>> I'm pretty sure we can still hear educated people say that free fall
>>>> speed depends on the weight of the object without realizing it's a
>>>> double mistake.
>>>
>>> Well, you have to qualify it better than this, because what you've
>>> stated in actually correct ... in a viscous fluid.
>>
>> By definition, that's not free fall.
>
> In a technical physics context. But he's talking about posing the
> question to generally educated people, not physicists (since physicists
> wouldn't make that error). In popular parlance, "free fall" just means
> falling freely without restraint (hence "free fall rides," "free
> falling," etc.). And in that context, in the Earth's atmosphere, you
> _will_ reach a terminal speed that is dependent on your mass (among
> other things).
>
> So you made precisely my point: The average person would not follow
> that the question was being asked was about an abstract (for people
> stuck on the surface of the Earth) physics principle, but rather would
> understand the question to be in a context where the supposedly-wrong
> statement is _actually true_.
So what's the "double mistake?" My understanding was (1) the misuse
(ok, vernacular use) of the term "free fall," and (2) the association of
weight with free-fall velocity ("If I tie an elephant's tail to a
mouse's, and drop them both into free fall, will the mouse slow the
elephant down?")
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