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Re: [Phys-l] Trampoline G Forces



There are many demonstrations that we all present to our students that
debunk the sales pitch being presented here. One that comes to mind is
the one with the fishing bobber in a jar. When a jar full of water
containing the bobber is accelerated (in a straight line or circular
path), the bobber surprisingly always moves in the same direction as the
acceleration. On the other hand, a steel ball in the jar will roll to
the side of the jar opposite to the direction of the acceleration
vector. The conclusion is that a neutrally buoyant object would do
neither. If cells in the body are neutrally buoyant, then they would not
be affected by the forces from the trampoline. Neither would the
contents of the cells, unless their density differed significantly from
that of water, which the biology faculty here tell me is not the case.

Bob at PC

-----Original Message-----
From: phys-l-bounces@carnot.physics.buffalo.edu [mailto:phys-l-
bounces@carnot.physics.buffalo.edu] On Behalf Of Bob Sciamanda
Sent: Sunday, September 30, 2007 10:04 AM
To: Forum for Physics Educators
Subject: [Phys-l] Trampoline G Forces

The following excerpts from the advertising for the Healthbounder (a
40 in diam trampoline) might provide fertile soil for class (and list)
discussions:
******************
"NASA scientists agree with what we have learned . . . They
discovered that since the cells of the body live in an essentially
zero-gravity environment, it's beneficial to alter the G-force in
order to stimulate the body's lymphatic system which removes toxins
from the cells. Rebounding, they discovered, is the only excercise
proven to exert the maximum amount of "pull" on the human body down to
the cellular level, with the least amount of effort.

. . . .

Gravity pulls you downward during the low point of the rebound cycle
just as our super-flexible pad pushes you upward into weightlessness.
During the rebound, you experience 2 to 4 "G-forces" meaning that
gravity works for you instead of against you. During this short
interval of added G-forces, your body acts as if it's carrying a heavy
weight. This period does not last long enough to produce strain, but
it's just long enough to start . . . Cleansing your arteries . . .
Cleansing your lymphatic system . . . Cleansing every cell in your
body . . . tone every muscle . . . strengthen your muscular-skeletal
mass . . ."
*****************
Have at it with your comments - perhaps primarily about the physics,
secondarily about the health effects.


Bob Sciamanda
Physics, Edinboro Univ of PA (Emeritus)
www.winbeam.com/~trebor
trebor@winbeam.com

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