Re: Newton's Second Law of Motion is not even wrong.
- From: "PD" <TheDraperFamily@xxxxxxxxx>
- Date: 15 Jan 2006 12:00:38 -0800
slavek krepelka wrote:
> PD wrote:
> >
> > slavek krepelka wrote:
> > > I have decided to show to whom ever may be interested:
> > >
> > > 1) that this law as stated by "F=ma" is down right wrong and incorrectly
> > > justified
> > > 2) where has the originator failed to correctly comprehend and interpret
> > > the standard experimental evidence
> > > 3) the correct relationship between force, mass and acceleration easily
> > > derived from static pressure in liquids and expressed by F=1/2ma^2.
> > >
> > > http://www3.sympatico.ca/slavek.krepelka/ttf2/force1.htm
> > >
> > > My kind regards, Slavek
> >
> > Your criticism is based on erroneous assumptions and incorrect
> > understanding of the term "weightlessness".
> >
> > You say for example:
> > ================
> > "Everybody" knows that the acceleration in the free fall is a balancing
> > act between inertia of a mass and gravitation. If there is no
> > acceleration of a body toward ground, the body weights the full
> > equivalent of its mass, i.e. its full weight, in our case 1 kg. When
> > the body is accelerating at the free fall rate toward ground, it is
> > weightless. When a body is hindered in its free fall by a force smaller
> > than the gravitational force and opposing the gravitational force, its
> > weight is in some proportion to the strength of the opposing force.
> > =================
> > This analysis is in fact incorrect, and it is not true that "everybody"
> > knows this. Indeed, I would say that only onebody know it.
> >
> > PD
>
> It appears that you have never taken a ride in a fast elevator. It might
> help your understanding of effects of acceleration on weight to take a
> once in a lifetime trip from your village and visit some larger urban
> center. This will give you and unprecedented opportunity to test ride a
> fast elevator in some high-rise building and directly observe what
> happens to weight with accelerating as well as decelerating of the
> elevator, up as well as down. You'll be truly amazed. Then talk to me
> about weight again if you still feel like it.
>
On the contrary, Slavek. I've already discussed with you what goes on
in a fast elevator, and pointed out that what changes is not your
weight but the contact force between your feet and the floor. You
commented that this view of weight was peculiar, even though this is
precisely what is taught in textbooks and what is consistent with
Newton's 2nd law.
PD
.
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