Parabolic flight | Wikipedia audio article
Channel: wikipedia tts
Date: 06/06/2019

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Weightlessness


00:01:32 1 Weightlessness in Newtonian mechanics
00:05:27 1.1 Stress during free fall
00:07:17 1.2 Force fields other than gravity
00:08:19 1.3 Weightlessness and proper acceleration
00:09:20 1.4 How to avoid weightlessness
00:10:51 1.4.1 Tidal forces
00:12:38 1.4.2 Frames of reference
00:13:59 1.4.3 Zero-g, "zero gravity", accelerometers
00:14:56 1.4.4 Sensation of weight
00:15:06 1.4.5 A common misconception
00:16:23 1.5 Relativity
00:18:52 1.6 Microgravity
00:22:10 2 Weightless and reduced weight environments
00:22:36 2.1 Reduced weight in aircraft
00:22:47 2.1.1 NASA's Reduced Gravity Aircraft
00:24:00 2.1.2 European Space Agency A310 Zero-G
00:25:07 2.1.3 Commercial flights for public passengers
00:26:37 2.2 Ground-based drop facilities
00:28:04 2.3 Neutral buoyancy
00:30:41 2.4 Weightlessness in a spacecraft
00:32:07 2.5 Weightlessness at the center of a planet
00:34:07 3 Human health effects
00:34:43 3.1 Effects on non-human organisms
00:38:30 4 Technical adaptation in zero-gravity
00:39:52 5 See also
00:40:49 6 Notes



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SUMMARY
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Weightlessness is the complete or near-complete absence of the sensation of weight. This is also termed zero-g, although the more correct term is "zero g-force". It occurs in the absence of any contact forces upon objects including the human body.
Weight is a measurement of the force on an object at rest in a relatively strong gravitational field (such as on the surface of the Earth). These weight-sensations originate from contact with supporting floors, seats, beds, scales, and the like. A sensation of weight is also produced, even when the gravitational field is zero, when contact forces act upon and overcome a body's inertia by mechanical, non-gravitational forces- such as in a centrifuge, a rotating space station, or within an accelerating vehicle.
When the gravitational field is non-uniform, a body in free fall experiences tidal effects and is not stress-free. Near a black hole, such tidal effects can be very strong. In the case of the Earth, the effects are minor, especially on objects of relatively small dimensions (such as the human body or a spacecraft) and the overall sensation of weightlessness in these cases is preserved. This condition is known as microgravity, and it prevails in orbiting spacecraft.