Eric;
There is no force on the nut unless there is force on the lever to crack
the nut, i.e. a force elsewhere effects the force on the nut, whether the
hands move or not. I think that is why your example is skewed. Something
somewhere has to cause that channe in force Eric. This is why I get
frustrated when someone jumps to kinetics without fully acknowledging that
kinematics must come into play.
If a force changed from one test to another, w/ and w/o an orthotic,
then some position of bone, or at a joint or joints changed to alter those
forces. And, if the calcaneus or STJ have show no measurable change, for
example, then something somewhere else that effects teh calcaneus or STJ had
to have moved or changed position to effect this change in forces.
Sincerely;
Bruce
----- Original Message -----
From: "Eric Fuller" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Thursday, December 16, 2004 8:02 PM
Subject: Re: EVA vs Plastic/Carbon Fibre FFO's: Discuss
> Hi all, Bruce wrote:
>
> > Since you compared the pressure on the nut to the STJ, I will use
that
> >as the basis for my question. What causes the pressure of the
nutcrackers
> >mouth or hands on the nut? It has to be the lever at the nutcrackers
back,
> >and this will be caused by pressure from somones hand and there arm, etc.
> > If that is the case, then your example is skewed. I get your point,
and
> >I think it is well meaning. But, the problem lies in explaining why the
arm
> >and hand on the lever of the nutcracker are no longer needing to push
down,
> >i.e. to "crack that particular nut!" Pun fully intended! ;-)
>
> Bruce, I don't understand your statement. The nutcracker analogy is to
> show that position does not correlate with stress. How is my example
skewed?
>
>
>
> Cheers,
>
> Eric Fuller
>
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