Im a skydiver... I think I understand gravity pretty well.

Quote from: EnglshGentleman on August 17, 2010, 10:07:00 AM

Quote from: ClockTower on August 17, 2010, 06:04:35 AM

Quote from: General Douchebag on August 17, 2010, 03:08:10 AM

I also don't recall any claims that the universe is infinite.

Lurk more.

John Davis states explicitly that the FE is infinite in his model. Tom Bishop has he doesn't know if the FE is finite or infinite. I'd think by now you'd know this.

By the way with the UA falsified, no finite FE works.

Reread the thread. We are not talking John Davis' infinite plane model.

Reread GD's post. We are talking about whether there has been a claim that the Universe is infinite.

lrn2context. He was talking about the discussion.

One quick question: if Terra is constantly moving up at 9.81 meters/second/second, how can we jump?

One quick question: if Terra is constantly moving up at 9.81 meters/second/second, how can we jump?

By accelerating ourselves upwards at 9.82 m/s² or better.

But how could we possibly push that hard? If Terra is moving at, say, 2000 mph when you jump, our muscles couldn't possibly move us at 2001 mph. If we could, we would certainly run much faster than we do.

But how could we possibly push that hard? If Terra is moving at, say, 2000 mph when you jump, our muscles couldn't possibly move us at 2001 mph. If we could, we would certainly run much faster than we do.

you dont even need general or special relativity for this, even with newton its easy:

when the earth is travelling at 2000mph, then everything on it is, too. Its quite an easy steht to move 2001 mph, then. You only need to gain one extra mile per hour of speed.

What you said is like, you cant even stand up in an airplane, because its SO fast! If you stand up, you will be thrown right to the back of it!
Which is obviously not true.

But how could we possibly push that hard? If Terra is moving at, say, 2000 mph when you jump, our muscles couldn't possibly move us at 2001 mph. If we could, we would certainly run much faster than we do.

Two things:

1) if you were travelling at 2000mph you would very easily be able to jump against the direction of travel. For example, when you're travelling at 500mph on an aeroplane you can move and act just as normal. This is because no force is being exerted on your body as a result of the planes speed.

2) It may be surprising but gravity is actually a very weak force.

But how could we possibly push that hard? If Terra is moving at, say, 2000 mph when you jump, our muscles couldn't possibly move us at 2001 mph. If we could, we would certainly run much faster than we do.

*sigh*  If gravity is pulling us down at 9.81 m/s², how can we possibly jump?  If you're in an airplane moving at 550 mph, how can you walk down the aisle to the front of the plane?

Gravity only begins to pull you down once you are in the air. When your feet are on the ground, resistance is equal to force, so Gravity is not still forcing you down. In your theory about Terra moving up, it never stops increasing speed, so instead of simply overcoming minimum gravity for the first second, you would need to overcome something moving at billions of miles per second, as its speed has been increasing for hundreds of millions of years (Or 6 thousand, according to some loonies). And watch an Olympic high-jumper on youtube. Could they really move that much faster than Terra for that long? Our muscles aren't that powerful. And for the airplane analogy, walking and jumping are two different things. If one were to jump on a plane, while it was accelerating, I daresay we would move backwards. Also, we can stand up on a plane because, for one, you are an attached object until you detach yourself, for instance by jumping. That means that we move at the same speed. Also, acceleration makes a big difference. If we were on a space shuttle accelerating directly upwards, we wouldn't be able to stand up.

Gravity only begins to pull you down once you are in the air. When your feet are on the ground, resistance is equal to force, so Gravity is not still forcing you down. In your theory about Terra moving up, it never stops increasing speed, so instead of simply overcoming minimum gravity for the first second, you would need to overcome something moving at billions of miles per second, as its speed has been increasing for hundreds of millions of years (Or 6 thousand, according to some loonies). And watch an Olympic high-jumper on youtube. Could they really move that much faster than Terra for that long? Our muscles aren't that powerful. And for the airplane analogy, walking and jumping are two different things. If one were to jump on a plane, while it was accelerating, I daresay we would move backwards. Also, we can stand up on a plane because, for one, you are an attached object until you detach yourself, for instance by jumping. That means that we move at the same speed. Also, acceleration makes a big difference. If we were on a space shuttle accelerating directly upwards, we wouldn't be able to stand up.

Some models of FET incorrectly apply Einstein's Equivalence Principle (EP) to solve this difficulty of explaining gravity and its effect.

While we know that the UA is false, EP does allow for some very limited mimicking of gravity--at a point.

Okay, thanks for a straight answer. I'm new here, so I don't actually know too much about any of your theories.

If one were to jump on a plane, while it was accelerating, I daresay we would move backwards. Also, we can stand up on a plane because, for one, you are an attached object until you detach yourself, for instance by jumping. That means that we move at the same speed. Also, acceleration makes a big difference. If we were on a space shuttle accelerating directly upwards, we wouldn't be able to stand up.

Yes, if we were to jump on a plane while it were accelerating, we would move in the opposite direction. Just like in UA. The reason why you can't stand up in the space shuttle is because the space shuttles are accelerating at hundreds of feet a second. Our bodies are not strong enough to over come all of those g forces.

Our bodies however, HAVE grown used to the constant acceleration of Earth, just as in RET, our bodies have grow accustom to the pull of gravity. You wouldn't be able to move under the gravity of Jupiter for example.

Okay, thanks for a straight answer. I'm new here, so I don't actually know too much about any of your theories.

Or rudimentary physics, it would seem.

Gravity only begins to pull you down once you are in the air. When your feet are on the ground, resistance is equal to force, so Gravity is not still forcing you down. In your theory about Terra moving up, it never stops increasing speed, so instead of simply overcoming minimum gravity for the first second, you would need to overcome something moving at billions of miles per second, as its speed has been increasing for hundreds of millions of years (Or 6 thousand, according to some loonies). And watch an Olympic high-jumper on youtube. Could they really move that much faster than Terra for that long? Our muscles aren't that powerful. And for the airplane analogy, walking and jumping are two different things. If one were to jump on a plane, while it was accelerating, I daresay we would move backwards. Also, we can stand up on a plane because, for one, you are an attached object until you detach yourself, for instance by jumping. That means that we move at the same speed. Also, acceleration makes a big difference. If we were on a space shuttle accelerating directly upwards, we wouldn't be able to stand up.

do you not get the difference between speed and acceleration?
sorry, but please do some science and maths classes, maybe graduate from high school before posting this shit.

especially, lrn2dynamics & lrn2analysis

Gravity only begins to pull you down once you are in the air. When your feet are on the ground, resistance is equal to force, so Gravity is not still forcing you down.

Ummm.... No.  Gravity is always pulling you down.  To test this assertion, you merely need to step on a scale.  As you may or may not recall from physics 101, weight is defined as mass*acceleration due to gravity.