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Line 6: '''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 force]]s upon objects including the human body. Weight is a measurement of the ~~attractive~~ force ~~between~~on an ~~bodies~~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-[[gravity\|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.

Weightlessness: Difference between revisions