4. Anti-gravity :
Anti-gravity is an idea of creating a place or object that is
free from the force of gravity.
It does not refer to the lack of weight under gravity
experienced in free fall or orbit, or to balancing the force of
gravity with some other force, such as electromagnetism or
aerodynamic lift.
Anti-gravity is a recurring concept in science fiction,
particularly in the context of spacecraft propulsion.
5. Why we need anti gravity:
Like most people, you probably took gravity for granted
before space flights began. You know Earth's normal
gravitational pull holds you to the seat of your chair-and more
importantly keeps you from being tossed into the air by the
Earth's rotation.
But gravity causes a lot of trouble and expense we seldom
think about. Aircraft and rocket builders have to provide
heavy engines and huge weights of fuel, just to offset gravity.
In construction of buildings, bridges and in a hundred other
ways gravity affects our lives and adds billions to the cost of
work. Gravity control could reduce or end many of these
problems.
6. Continue:
Global Warming obviously now affecting us, in the next
20 or 30 years or so when our planet will be too hot to
live in, we could use anti gravity technology and anti
gravity propulsion to explore space much more
adequately and find suitable planets to migrate.
7. Newton's theory of general relativity:
In Newton's law of universal gravitation, gravity was an
external force transmitted by unknown means.
In the 20th century, Newton's model was replaced by general
relativity where gravity is not a force but the result of the
geometry of space-time.
Under general relativity, anti-gravity is impossible except
under contrived circumstances.
8. How to produce anti-gravity:
One easiest way to produce anti-gravity is described by sir
Hermann Bond using negative mass.
Sir Hermann Bond proposed in 1957 that negative
gravitational mass, combined with negative inertial mass,
would comply with the strong equivalence principle of
general relativity theory.
9. Sir Hermann Bond pointed out that a negative mass will fall
toward (and not away from) the matter, since although the
gravitational force is repulsive, on the other hand, normal mass
will fall away from the matter.
The negative mass (according to Newton's law, F=ma)
responds by accelerating in the opposite of the direction of the
force. He noted that two identical masses, one positive and one
negative, placed near each other will therefore self-accelerate
in the direction of the line between them, then the negative
mass chasing after the positive mass. So negative mass will
show the anti-gravity effect.
10. Negative mass:
In theoretical physics, negative mass is a hypothetical
concept of matter whose mass is of opposite sign to
the mass of normal matter, e.g. −2 kg. Such matter
would violate one or more energy conditions and
show some strange properties.
11. Anti-gravity devices:
Anti-gravity devices produce a force when twisted that operates
"out of plane" and can appear to lift themselves against gravity.
A device is shown invented by Henry Wallace. His device is consists
of super conducting ceramic ring and solenoids.
He claimed that by passing
current through solenoid
results in creating a
"gravitomagnetic" field
which shows anti gravity
effect.
12. NASA antigravity machine:
NASA researchers hope to conduct an experiment that could
determine if the force of gravity might someday be adjusted,
like the volume of a radio.
"In 1992, Dr. Eugene published the results of his experiment
with high-temperature ceramic superconductors,”
"He devised an experiment in which a disc of superconducting
material was magnetically levitated and rotated at high speed,
up to several thousand rpm, in the presence of an external
magnetic field.
13. Continue:
He noted that objects above the rotating disk showed a
variable but measurable loss of weight, from less than .5% to
about 2%. Loss of weight is sample of impossibility of
antigravity..
