Re: The Olympics

[John Barrer <forcejb@YAHOO.COM>]

Doug - I see your point, BUT if that's so, then "how
come" an egg drop project that is top-heavy will
rapidly tumble on its way to the floor. I have seen
many toothpick projects with the egg perched on top of
an elaborate energy-absorbing structure quickly rotate
in free fall so that the egg lands first! John Barrere
--- Doug Craigen <dcc@ESCAPE.CA> wrote:
> John Barrer wrote:
> > Suppose a diver leaves the platform with NO
> angular
> > momentum. If she then bends at the waist, the
> Earth
> > can then supply the external torque to initiate
> > rotation. Now there is plenty of angular momentum
>
> I don't see how the earth can apply a net torque to
> a body in free
> fall.  Can you draw a free body diagram that shows
> how this would
> happen?
>
> > available to be conserved. Of course, if this is
> true,
> > then it would be impossible to start the routine
> with
> > a twist. A "tumble" (or some other rotation caused
> by
> > the diver orienting a portion of her body so that
> an
> > external torque would be supplied by the Earth)
> would
> > have to initiate the dive or any other similar
> move.
> > Is this so?? John Barrere   Apex HS  Apex, NC
\_/^\_/^\_/^\_/^\_/^\_/^\_/^\_/^\_/^\_/^\_/^\_/^\_/^\
> Doug Craigen
http://www.dctech.com/physics/about_dc.html


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