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How fast does the earth need to rotate to realize 0 gravity?

S

spidey07

No Lifer
This seems really dumb, but could be fun.

Just how fast does the earth need to rotate before we effectively feel zero gravity?

I'm guessing it would have to be infinite because gravity doesn't change, it's always there. How much to reduce gravity's affect by 1 M/s^2?
 
Don't forget the atmosphere and loss of friction the second we lift off from the ground. The earth will rotate without us standing on it and we will not land where we took off from.
 
Originally posted by: tranceport
Don't forget the atmosphere and loss of friction the second we lift off from the ground. The earth will rotate without us standing on it and we will not land where we took off from.
Click to expand...

Yeah, it could get pretty gnarly.

They may have to send some people down in a little ship to restart the earth's core.
 
Originally posted by: tranceport
Don't forget the atmosphere and loss of friction the second we lift off from the ground. The earth will rotate without us standing on it and we will not land where we took off from.
Click to expand...

That would be cool until something got in the way, say like a mountain range :Q

 
Originally posted by: tranceport
Don't forget the atmosphere and loss of friction the second we lift off from the ground. The earth will rotate without us standing on it and we will not land where we took off from.
Click to expand...
Huh? Horizontal velocity is constant. Only vertical velocity is changing.
 
Originally posted by: her209
Originally posted by: tranceport
Don't forget the atmosphere and loss of friction the second we lift off from the ground. The earth will rotate without us standing on it and we will not land where we took off from.
Click to expand...
Huh? Horizontal velocity is constant. Only vertical velocity is changing.
Click to expand...

Yeah, we'd just float freely in the same spot

But that whole atmosphere thing would make it a little hard to breathe. Oceans would be a little messed up as well. 😉 High tide would be measured in hundreds of miles above sea level. Heck, the moon may even take all our water and our atmosphere.
 
Originally posted by: spidey07
Originally posted by: tranceport
Don't forget the atmosphere and loss of friction the second we lift off from the ground. The earth will rotate without us standing on it and we will not land where we took off from.
Click to expand...

Yeah, it could get pretty gnarly.

They may have to send some people down in a little ship to restart the earth's core.
Click to expand...

I am stockpiling unobtanium as we speak.
 
Uh, wouldn't the earth have to STOP spinning to achieve zero gravity.
IIRC from High School science, the rotation of the earth is what produces gravity.
 
Originally posted by: jupiter57
Uh, wouldn't the earth have to STOP spinning to achieve zero gravity.
IIRC from High School science, the rotation of the earth is what produces gravity.
Click to expand...

😕
 
Originally posted by: jupiter57
Uh, wouldn't the earth have to STOP spinning to achieve zero gravity.
IIRC from High School science, the rotation of the earth is what produces gravity.
Click to expand...

you may have confused it with the magnetic field of earth
 
Originally posted by: MmmSkyscraper
Originally posted by: tranceport
Don't forget the atmosphere and loss of friction the second we lift off from the ground. The earth will rotate without us standing on it and we will not land where we took off from.
Click to expand...

That would be cool until something got in the way, say like a mountain range :Q
Click to expand...

That produce a really awesome mental image.
 
Originally posted by: spidey07
This seems really dumb, but could be fun.

Just how fast does the earth need to rotate before we effectively feel zero gravity?

I'm guessing it would have to be infinite because gravity doesn't change, it's always there. How much to reduce gravity's affect by 1 M/s^2?
Click to expand...

Actually, it's not really dumb. That question comes up nearly every time I work on circular motion with students.
 
Originally posted by: spidey07
Originally posted by: her209
Originally posted by: tranceport
Don't forget the atmosphere and loss of friction the second we lift off from the ground. The earth will rotate without us standing on it and we will not land where we took off from.
Click to expand...
Huh? Horizontal velocity is constant. Only vertical velocity is changing.
Click to expand...
Yeah, we'd just float freely in the same spot

But that whole atmosphere thing would make it a little hard to breathe. Oceans would be a little messed up as well. 😉 High tide would be measured in hundreds of miles above sea level. Heck, the moon may even take all our water and our atmosphere.
Click to expand...
Actually, when you think about the scenario, once your feet leaves the Earth, the only force acting on you is gravity so you would fall back down eventually.
 
Originally posted by: tranceport
Don't forget the atmosphere and loss of friction the second we lift off from the ground. The earth will rotate without us standing on it and we will not land where we took off from.
Click to expand...

Actually you would land where you took off from, because you, the air and everything else near the earth is all rotating at the same speed.
 
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