Zero Gravity
Weightlessness (or zero-g) is the condition that exists for an object or person when they experience little or no acceleration away from the acceleration that defines an inertial trajectory, or the trajectory of pure free-fall. The physical path of an inertial trajectory depends on the presence or absence of gravitation. If objects are far from a planet, star, or other such massive body, so that they experience little gravitational interaction, they will experience weightlessness if they are not accelerating. Physically, they follow Newton's first law of motion which describes linear motion, without forces. The presence of a gravitational field will cause a free body to follow the accelerated trajectory of a free fall in gravity, and weightlessness will also be experienced during any such naturally-accelerated free fall. Such a situation, except for microgravity effects, cannot be distinguished from weightlessness due to absence of gravity from a nearby body.
As an example, an accelerated free fall trajectory allows the weightlessness of objects in a falling elevator. The same type of accelerated free fall trajectory causes weightlessness of objects in orbit about the Earth. Such objects are in free fall toward the Earth, as in the falling elevator, but they do not strike the ground because their forward speed is high enough that the curved surface of the Earth drops downward and away from the object, as fast as the object falls toward the Earth. An astronaut inside an orbiting vehicle has the experience of "zero-g," because the action and acceleration due to gravity by itself does not cause a sensation of weight, and all of the other types of forces that do cause such sensations (such as mechanical pushes from the floor or other surfaces that cause g-force acceleration) are absent.
To experience zero gravity you should try taking a ride on a plane called the G-Force One. Here is some information on G-Force One.
Aboard their specially modified Boeing 727, G-FORCE ONE, weightlessness is achieved by doing aerobatic maneuvers known as parabolas. Specially trained pilots perform these aerobatic maneuvers which are not simulated in any way. ZERO-G's passengers experience true weightlessness.
Before starting a parabola, G-FORCE ONE flies level to the horizon at an altitude of 24,000 feet. The pilots then begins to pull up, gradually increasing the angle of the aircraft to about 45° to the horizon reaching an altitude of 34,000 feet. During this pull-up, passengers will feel the pull of 1.8 Gs. Next the plane is "pushed over" to create the zero gravity segment of the parabola. For the next 20-30 seconds everything in the plane is weightless. Next a gentle pull-out is started which allows the flyers to stabilize on the aircraft floor. This maneuver is repeated 12-15 times, each taking about ten miles of airspace to perform.
You can learn more about G-Force One at their website.
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