How Did the Earth Form Then?

No. The ISS is not accelerating towards the earth to any significant degree. If the ISS accelerated anywhere the astronauts would be pinned to the sides of the craft and such water experiments would not be possible.

In RE the ISS is in orbit around the earth moving at a set velocity. It is not accelerating around the earth. It is not accelerating towards the earth. THe ISS is weightless because it is in free fall. An acceleration means that a body is moving at a faster speed every second.

If the ISS were accelerating *anywhere* at a significant rate the astronauts would be pinned to the side of the craft.

The ISS remains at all times the same altitude above the earth. It is not accelerating towards the earth.

Yes it does. Look up "acceleration". It's always defined as a rate of change in velocity.

If the ISS were in a continuous acceleration towards the earth do you realize how fast it would be going by now?

There is an upwards centripetal force put upon the ISS as a centripetal byproduct of its orbit around the earth.

The ISS is caught between accelerations; its orbit is at a precise altitude and speed necessary for this special lagrange point where weightlessness is possible.

The acceleration due to change in the direction of the velocity is found by noticing that the velocity completely rotates direction in the same time T the object takes for one rotation. Thus, the velocity vector sweeps out a path of length 2*Pi*v every T seconds, or:

    a = (2*Pi*v)/T = w² R

and is directed radially inward.

Yes it does. Look up "acceleration". It's always defined as a rate of change in velocity.

Ergo, an object in orbit is constantly accelerating.

Ergo, an object in orbit is constantly accelerating.

A calculus proof of this is very easy -- just write circular motion as x=Rsin(wt) and y=Rcos(wt) and differentiate twice wrt t. Why don't you try it, TB?

I think Tom understands orbit he must have been trying out a new trolling idea. He's trying to redefine orbit so it doesn't involve acceleration. Or something.  Huh Either way: Fail.

Tom, I think that you may want to review how orbits work:

The ISS would be accelerated outwards away from the earth if the earth's 'gravity' did not exist. However, it does.

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Ergo, an object in orbit is constantly accelerating.

A calculus proof of this is very easy -- just write circular motion as x=Rsin(wt) and y=Rcos(wt) and differentiate twice wrt t. Why don't you try it, TB?

That would be centripetal acceleration, which is canceled out by the earth's "gravity."

People in this thread have claimed that the ISS is accelerating towards the earth by gravity. It's not. If it were, the crafts occupants would be pinned to one side of the craft and could not float around.

Now you claim that the ISS is accelerating to the heavens by centripetal acceleration. It's not. If it were, the craft's occupants would be pinned to one side of the craft and could not float around.

The ISS is not accelerating anywhere. The ISS is perfectly buoyant weightless between the two accelerations.

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Tom, I think that you may want to review how orbits work:

I think you may want to try again in our explanation how the ISS is actively accelerating to or away from the earth while its occupants remain perfectly weightless.

Quote from: Tom Bishop on June 15, 2008, 02:10:23 PM

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Acceleration does not imply an increase in speed.

Yes it does. Look up "acceleration". It's always defined as a rate of change in velocity.

Velocity is a vector combining speed and direction.  The ISS has a constant speed, but its direction is constantly changing (you know, going around in a great big circle).

^ Your point was?

Velocity is a vector combining speed and direction.  The ISS has a constant speed, but its direction is constantly changing (you know, going around in a great big circle).

Let me sum up. An object in circular motion is accelerating -- this is a fundamental property of circular motion. In the case of orbit, this acceleration is provided by gravity. There are no other forces acting on the ISS, apart from the small force of atmospheric drag.

Constant speed * change in direction = acceleration.

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Velocity is a vector combining speed and direction.  The ISS has a constant speed, but its direction is constantly changing (you know, going around in a great big circle).

Without the earth's gravity the ISS would be accelerated outwards away from the center of rotation. The craft and its occupants would be flung away from the center of rotation much like when you ride around on a merry-go-round.

This is called centripetal acceleration and does not occur because the earth's gravity is perfectly counteracting it. This is why the Astronauts are weightless. The ISS is neither accelerating towards the earth or towards the cosmos. The ISS is in near perfect weightlessness between the two forces/accelerations at work.

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Constant speed * change in direction = acceleration.

That would be true, the circular motion attempts to accelerate the craft outwards; however, the ISS isn't being accelerated outwards away from the earth because 'gravity' is holding it in. It is caught between the two. accelerations The ISS isn't being physically accelerated anywhere. The ISS remains at all times the same altitude above the earth.

Quote from: Tom Bishop on June 16, 2008, 12:47:27 PM

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Velocity is a vector combining speed and direction.  The ISS has a constant speed, but its direction is constantly changing (you know, going around in a great big circle).

Without the earth's gravity the ISS would be accelerated outwards away from the center of rotation. The craft and its occupants would be flung away from the center of rotation much like when you ride around on a merry-go-round.

This is called centripetal acceleration and does not occur because the earth's gravity is perfectly counteracting it. This is why the Astronauts are weightless. The ISS is neither accelerating towards the earth or towards the cosmos. The ISS is in near perfect weightlessness between the two forces/accelerations at work.

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Constant speed * change in direction = acceleration.

That would be true, the circular motion attempts to accelerate the craft outwards; however, the ISS isn't being accelerated outwards away from the earth because 'gravity' is holding it in. It is caught between the two. accelerations The ISS isn't being physically accelerated anywhere. The ISS remains at all times the same altitude above the earth.

Im not too bright on this physics stuff but isn't that centrifugal force?  Or is that the same thing?

Without the earth's gravity the ISS would be accelerated outwards away from the center of rotation. The craft and its occupants would be flung away from the center of rotation much like when you spin around on a merry-go-round.

This is called centripetal acceleration and does not occur because the earth's gravity is perfectly counteracting it. This is why the Astronauts are weightless. The ISS is neither accelerating towards the earth or towards the cosmos. The ISS is in near perfect weightlessness between the two accelerations at work.

No. The ISS attempts to accelerate from the earth in its circular motion. However it does not because 'gravity' is holding it in. The ISS does not accelerate anywhere. If the ISS were truly and physically accelerating from the earth the ISS would soon fly off into space and its occupants would eventually die.

That's true. By its circular motion there is an acceleration put upon the craft and its occupants to fly off away from the center of rotation like a kid on a merry-go-round. However this acceleration of the ISS is perfectly counteracted by the earth's 'gravity' and the ISS and its occupants do not physically accelerate anywhere. They are weightless. They do not physically accelerate towards the earth. They are not flung into the cosmos by circular motion.

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And yeah, thats why all the other planets we observe, not even limited to this solar system, formed flat right?

Try again.

In FE the planets are tiny little things less than three miles diameter which fly past overhead. They are not "worlds," and therefore have no connection to the earth beneath our feet.

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Saturn and its rings rotate.  The flat earth does not.

Saturn's Rings were made flat through acceleration, just as the earth is made flat through an upwards acceleration.

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Can this be proven? I can go on forever and ever. This thread isn't about the future. This thread is about how the Earth formed. Which still people have failed to explained.

Already explained. Upwards acceleration causes malleable objects to become flattened over long periods of time. The earth is malleable because it is composed of dirt, sand, and water.

As far as where all mass and matter came from, that would be an unknown. Some Big Bang Cosmologies hypothesize a cascadence of higher dimensions which collapsed into a singularity, filling our universe with high levels of energy which eventually cooled and formed matter.

At the moment of the Big Bang matter and energy was shot out and accelerated in all directions. The acceleration from the Big Bang continues to this very day, known as Dark Energy, expanding the earth and universe away from itself. Look up the Accelerating Universe.

That's true. By its circular motion there is an acceleration put upon the craft and its occupants to fly off away from the center of rotation like a kid on a merry-go-round. However this acceleration of the ISS is perfectly counteracted by the earth's 'gravity' and the ISS and its occupants do not physically accelerate anywhere. They are weightless. They do not physically accelerate towards the earth. They are not flung into the cosmos by circular motion.

The ISS is not physically accelerating anywhere.