Explanation of weightlessness in orbit

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Uploaded by on Aug 21, 2007

Astronauts don't escape the earth's gravitational field in orbit... so why are they, and any unsecured objects, weightless?

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  • No, there is no "lift" on the space vehicles.  It is NOT a balance of forces. The astronauts and vehicle are simply falling towards the Earth, but going real fast forward. Just like a ball thrown sideways will gradually curve down to the ground, if you throw it faster and faster, it goes further before hitting the ground. If you throw it superfast, as it falls, the curved Earth falls underneath it. It's then falling around the Earth.

  • If you stood around in the same spot for a couple of hours after firing the bullet, sure.

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  • @AutoPsychotic without an atmosphere it could travel at that altitude, but it would be going way way faster than higher orbit.

  • @Doctor699 Fair point, a bullet could be accelerated to those kind of speeds in orbit, with little to no air friction. But not anywhere near ground level.

  • @AutoPsychotic unless it is going at 27,000mph, then it will stab you in the back in 90 minutes.

  • very nice

  • If you shoot the bullet along the equator, then you could hit yourself. Anywhere else off the equator, the Earth's rotation will take you away from that bullet's orbital path. There may be a time in the future when the bullet and you meet after many orbits and rotations of the Earth.

  • @ThirdSon13 .... I don't agree!!! you and the bullet are initially are rotating with Earth.... you are both in the same reference frame.....Even when you shoot the bullet...it is still in the same frame as you..... it is like being on a boat and you throw a ball high.....the ball will take the speed of the boat....as well as the shooting speed.

  • Centripetal force!

  • so if you would take in consideration all the rotations that the earth (and you) make you would be able to shoot yourself in the back?

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