Re: Newton's Second Law of Motion is not even wrong.

Dear PD,

The force exerted by a mass which has mass value of 1 kg is weight of
that mass, when acted upon by earth gravity. The equivalent value unit
of 1 g is used as the unit of acceleration. When a body with mass of 1
kg is accelerated so, that the force it exerts on whatever is pushing,
or pulling it is equivalent to force it would weight on earth.

Get it into your thick head. You are mixing weight and mass. Mass is
always constant, as opposed to weight, which is subject to differences
in the strength of gravitational field (lets say moon having 1/6 of the
attractive force of earth), or the value of the rate of acceleration,
therefore relative.

That is why an astronaut in a space shuttle in a stable orbit weights
nothing. The weight caused by earth gravitation is directionally
countered by the weight caused by the centrifugal force, i.e.
acceleration, while his mass remains unchanged at lets say 75 kg.

Dip your nose into some elementary physics textbook or at least Webster
(that is a standard American dictionary available even in some
supermarkets) and lay off.

Got it? Slavek

PD wrote:
>
> 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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