In short: Gravity is the sheer force that weighs us down; called weight.

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On 13 Dec 2003 14:36:45 GMT, wrote:

In short: Gravity is the sheer force that weighs us down; called weight.

That is like saying that water is wet.

--

Boris Mohar

wrote:

In short: Gravity is the sheer force that weighs us down; called weight.


Ref: http://scienceworld.wolfram.com/physics/Gravity.html
Ref: Hartle, "Gravity: An Introduction to Einstein's General Relativity", Addison
Wesley (2003)

"A few properties of the gravitational interaction that help explain when
gravity is important can already be seen from the gravitational force law

F_grav = G m_1 m_2 / r_12^2

o Gravity is a universal interaction in Newtonian theory between all mass, and,
since E = mc^2, in relativistic gravity between all forms of energy.

o Gravity is unscreened. There are no negative gravitational charges to cancel
positive ones, and therefore it is not possible to shield (screen) the gravitational
interaction. Gravity is always attractive.

o Gravity is a long-range interaction. The Newtonian force law ia a 1/r^2
interaction. There is no length scale that sets a range for gravitational
interactions as there is for the strong and weak interactions.

o Gravity is the weakest of the four fundamental interactions acting between
individual elementary particles at accessible energy scales. The ratio of
the gravitational attraction to the electromagnetic repulsion between two
protons separated by a distance r is

F_grav G m_p^2 / r^2 G m_p^2
-------- = -------------------- = ------------- ~ 10^-36
F_elec e^2 / (4 pi e_0 r^2) (e^2/4pi e_0)

where m_p is the mass of the proton and e is its charge.

These four facts explain a great deal about the role gravity plays in physical
phenomena. They explain, for example, why, although it is the weakest force,
gravity governs the organization of the universe on the largest distance
scales of astrophysics and cosmology. These distance scales are far beyond
the subatomic ranges of the strong and the weak interactions. Electromagnetic
interactions COULD be long range were there any large-scale objects with net
electric charge. But the universe is electrically neutral, and electromagnetic
forces are so much stronger than gravitational forces that any large-scale net
charge is quickly neutralized. Gravity is left to govern the structure of the
universe on the largest scales.

wrote in message ...
In short: Gravity is the sheer force that weighs us down; called weight.

Did someone say something different?

wrote:
In short: Gravity is the sheer force that weighs us down; called weight.

Go away, ****Head.

In sci.physics, Boris Mohar

wrote
on Sat, 13 Dec 2003 10:13:03 -0500
:
On 13 Dec 2003 14:36:45 GMT, wrote:

In short: Gravity is the sheer force that weighs us down; called weight.

That is like saying that water is wet.


Not quite that simple.

[1] Water wetness: what does it mean? There are several
factors that lead us to the conclusion that water is
wet; for starters, the adhesion meniscus. Most people,
I would think, conclude something is wet (usually,
clothing) by noticing that it is cooler and maybe
heavier than normal. (I'm not sure what to conclude
regarding hot water, though.)

[2] Gravity is a weird "force". GR, if I'm not totally
mistaken, suggests that space is warped in the
region of mass (e.g., the planet Earth); this warpage
manifests itself as a force, at least to the casual
observer. But is it, really? I can't say for sure.
But it's close enough for most non-relativistic
observations. :-)

--
#191,
It's still legal to go .sigless.

In article , writes:

All objects; bodies and masses of that material substance that we call
matter
have one property in common: This property, called inertia, is their
indisposition, or inability to change their own motion.

They all depend on each other to supply the thrust; to force a change in
_each
other's_ motion: This change in speed and/or direction, is the
acceleration;
which is directly proportional to the quantity of matter, or mass that they
each contain:

That is upon collision any two bodies exert a mutual equal and opposite
thrust; but the change in motion, or acceleration, that is imparted will be
directly proportional to the mass of each body; with the smaller lighter
body
responding, or accelerating faster than the heavier more massive one:

This can be shown mathematically as: The mutual force [f] between two
bodies
[m1 and m2], produces accelerations [a1 and a2] that are directly
proportional; so that [f = (m1)(a1) = (m2)(a2)]!


SO: Now we’re back to the old “can’t do” f = ma: If given m = 1 kilogram, and
a = 1 m/sec^2 we get: f = 1 kg sec^2/m = 1 newton: But in classical physics
doesn’t 1 newton = 1 m·kg·s-2 ??

_Let’s do it right_; you know, first since m = (f/a) = (w/g): We’ll have: f =
ma :: (f/a)a = f, and w = mg :: (w/g)g = w!

Force_f_ [and _w_] are fundamental: Without units!


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wrote in message ...
[snip]

SO: Now we?re back to the old ?can?t do? f = ma: If given m = 1 kilogram, and
a = 1 m/sec^2 we get: f = 1 kg sec^2/m = 1 newton: But in classical physics
doesn?t 1 newton = 1 m·kg·s-2 ??

_Let?s do it right_; you know, first since m = (f/a) = (w/g): We?ll have: f = ma :: (f/a)a = f, and w = mg :: (w/g)g = w!

That's some pretty trippy math you've got going on there. Here's
basically what you've done, except to simply, I'll use the following
equation:
x + y = 1.

So, y = 1 - x and x = 1 - y.
Now, I'll take my equation for y, and substitute it into my original
equation:
x + (1 - x) = 1
0 = 0

Likewise for x:
(1 - y) + y = 1
0 = 0

What a fabulous result. Now, here's what you've actually done:

F = ma.
m = F/a
Substituate back into original equation:
F = (F/a)a
F = F --which is true, for any F.

And:

W = mg
m = W/g
Sub back into original equation:
W = (W/g)g
W = W

Now go back to grade school and learn how to *properly* solve a system
of equations.

A.


Force_f_ [and _w_] are fundamental: Without units!


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