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From: The Starmaker <starmaker@ix.netcom.com>
Newsgroups: sci.physics.relativity
Subject: Re: What is the force that the Earth used to keep us on the ground?
Date: Wed, 21 Dec 2022 19:40:26 -0800
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Richard Hertz wrote:
> 
> 1-vector, 2-vector, n-vector....... fuck it.
> 
> Given a(t) for an object moving along x-axis, then
> 
> IF da/dt = 0, the acceleration peaked or is constant.
> 
> IF da/dt > 0, the acceleration is increasing, so the object is gaining velocity (speed). It's ACCELERATING.
> 
> IF da/dt < 0, the acceleration is decreasing, so the object is losing velocity (speed). It's DECELERATING, like in
> the re-entry of a spacecraft.


NOT losing velocity....it's called a 'change' in velosity.


Any change in velosity increasing or decreasing is
called...acceleration.


-- 
The Starmaker -- To question the unquestionable, ask the unaskable,
 to think the unthinkable, mention the unmentionable, say the unsayable,
and challenge
 the unchallengeable.