🚀 go-pugleaf

me wrote:
> 
> On Mon, 09 Dec 1996 08:45:10 -0600, bna...@ipa.net (Brian H. Napier)
> wrote:
> 
> >
> >   A word about time dilation.  There is only a time dialation
> >during acceleration.  Time flows more slowly the higher the
> >acceleration is.  

Time dilation is affected by velocity not acceleration (sorry!)

> >This can/has been tested on Earth.  The
> >Gravity we feel is acceleration. We are acceleratiog towards the
> >center of the Earth at a rate of 9.8 m/sec.  

<snip>

> 
> maybe its just me, but i always thought that acceleration meant the
> change in one's speed and/or direction, therefore if i am sitting in
> this chair, the only acceleration i am doing is due to the earth
> spinning and orbiting the sun. since my speed toward the center of the
> earth is zero, and does not change unless i fall out of the chair
> (which has been known to happen), so whether i am at sea level or
> 10000 meters, as long as i am not going up or down, acceleration
> towards the center of the earth is always zero.
> 

You're nearly right. Acceleration actually just means a change in 
one's velocity, direction is integral to velocity.
While we are not actually accelerating towards the earth at 9.8m/s^2
(m/s is a measure of velocity not acceleration). The gravity we feel
is a force that would cause an acceleration of 9.8m/s^2 if we
were allowed to fall.

The acceleration due to gravity is independant of mass.

Barry.

-- 
E-mail: Barry_...@hp.com
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