Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!zaphod.mps.ohio-state.edu!samsung!uunet!lhdsy1!yzarn
From: yzarn@lhdsy1.chevron.com (Philip Yzarn de Louraille)
Newsgroups: rec.skydiving
Subject: Re: Graph of osc'n due to high windforce
Message-ID: <998@lhdsy1.chevron.com>
Date: 25 Jun 91 18:02:01 GMT
References: <1991Jun21.145113.6028@Stardent.COM> <994@lhdsy1.chevron.com> <1991Jun24.155154.14380@rodan.acs.syr.edu>
Organization: Chevron Oil Field Research, La Habra, CA.
Lines: 30

In article <1991Jun24.155154.14380@rodan.acs.syr.edu> greeny@top.cis.syr.edu (Jonathan Greenfield) writes:
>In article <994@lhdsy1.chevron.com> yzarn@lhdsy1.chevron.com (Philip Yzarn de Louraille) writes:
>
>>>Well, this all depends on how you look at it.  I did not check your math,
>>>so assuming your numbers are correct, the skydiver would feel 1.02265 g.
>>>This is because if terminal were constant the whole way down, he would
>>>feel exactly 1.0 g (assuming "g" is not changing with altitude).  While
>>>we are on the ground we feel 1.0 g because we have a constant (zero)
>>>change in velocity.  True, he would feel an added acceleration of
>>>0.02265 g upward (more than normal), but the total "g's" he would feel
>>>would be more than 1.0.
>>
>>Nooooo. I said one down (assuming g not changing with altitude, and
>>remember, Earth is attracting us, so g is toward the center of the
>>Earth) and 0.023 (rounded) up, which would mean his acceleration is less
>>than one.
>>Look at it this way, since we agree that the skydiver's terminal
>>velocity is slowing down as he/she gets lower in the atmosphere, how
>>could his/her acceleration be greater than g? I don' get it.
>
>When you stand up, don't you feel a 1 g force at your feet?  We can not
>*feel* gravitational forces, but we can *feel* the forces that offset
>gravitation.

YES! Just my point.
-- 
  Philip Yzarn de Louraille                 Internet: yzarn@chevron.com
  Research Support Division                 Unix & Open Systems
  Chevron Information & Technology Co.      Tel: (213) 694-9232
  P.O. Box 446, La Habra, CA 90633-0446     Fax: (213) 694-7709