#ZERO GRAVITY FREE#
a) Zero gravity and weightless b) Zero gravity but not weightless (Spring is rocket propelled) c) Spring is in free fall and weightless d) Spring rests on a plinth and has both weight 1 and weight 2.
In the right half, it is in a uniform gravitation field. In the left half, the spring is far away from any gravity source. This condition is known as microgravity, and it prevails in orbiting spacecraft. 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. Near a black hole, such tidal effects can be very strong. When the gravitational field is non-uniform, a body in free fall experiences tidal effects and is not stress-free. 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. These weight-sensations originate from contact with supporting floors, seats, beds, scales, and the like. 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). It is also termed zero gravity, zero G-force, or zero-G. Weightlessness is the complete or near-complete absence of the sensation of weight. Michael Foale can be seen exercising in the foreground. Astronauts on the International Space Station experience only microgravity and thus display an example of weightlessness.
0 kommentar(er)
