Gravity

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Josho

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Gravity, what can we do with it? Could it be used for other things like making electricity? Is there anyway we could take advantage of it? Is gravity the same all around the earth?
 
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lforrest

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We already take advantage of gravity.

0b9bcfc76eae71b4e44425188fa8978a.jpg
 

liafailrock

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I have a gravity operated clock using potential energy stored E=mgh.
 
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lforrest

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In mathematics gravity would be considered a conservative vector field. The potential energy of an object between two points is the same regardless of the path it takes from A to B.
 

bbyrd009

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Gravity, what can we do with it? Could it be used for other things like making electricity? Is there anyway we could take advantage of it? Is gravity the same all around the earth?
gravity implies anti gravity, which is i believe what you are looking for here. solve that!
 

Job

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If you have the high ground and you're engaged in a rock fight, gravity's your friend.
 

liafailrock

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In mathematics gravity would be considered a conservative vector field. The potential energy of an object between two points is the same regardless of the path it takes from A to B.

That's correct. Despite the path, if we integrate the force as some function of distance over it's path (from A to B), we find that the area is the same if it simply moved vertically from A to B. Such is the case of my gravity operated clock. I'm so happy that the cuckoo clock's weights drop vertically so as to spare me of those calculations. :D
 
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lforrest

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One method of generating power directly from gravity is tidal generators, which take advantage of the tides as the name suggests.
 

Josho

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In mathematics gravity would be considered a conservative vector field. The potential energy of an object between two points is the same regardless of the path it takes from A to B.

Diagram please? hahhaha this is probably some pretty basic stuff, but it looks like we got some intelligent minds around here, I haven't had a look at Job's video yet, but looking at liafailrock's post that would mean gravity is all the same between solid ground and the earths atmosphere? Is that what you 2 are saying?
 

Josho

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Hmm interesting, but are they all optical illusions hahaha, there's a spot where i ride a mountain bike on this range, and I cycle uphill, but there is a certain point on my way up, it starts to feel like I am going downhill, or on the flat, because the pedalling speeds up, and it's easier to cycle on that part of the mountain range, but it still looks like I'm going uphill, could anyone around here explain that besides an optical illusion? it's literally 2-3 times as easy to cycle on that part of the mountain, while it still looks like I'm looking into the uphill, up the road when I'm riding the bike, and there doesn't seem to be a noticeable change of gradient. lol
 

lforrest

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Diagram please? hahhaha this is probably some pretty basic stuff, but it looks like we got some intelligent minds around here, I haven't had a look at Job's video yet, but looking at liafailrock's post that would mean gravity is all the same between solid ground and the earths atmosphere? Is that what you 2 are saying?

It is hard for me to explain, it is part of what I would consider high math. A vector field defines the vector for any point on the graph, and it can be a 2D or 3D field or more if you can conceive of such a thing. Vectors are in basic physics, and represent a direction and magnitude from a point. Gravity can be represented as a vector because it is in a direction (down) and has a magnitude (~ 9.8 m/s2 at sea level). We simplify gravity on earth because the earth is massive compared to anything we build. In reality any two objects have gravitational attraction based on their distance and respective masses. Even a satellite orbiting the earth experiences gravity, and is kept aloft by its high velocity which decays very slowly in orbit.
 
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Yehren

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Gravity, what can we do with it? Could it be used for other things like making electricity? Is there anyway we could take advantage of it? Is gravity the same all around the earth?

Sure. That's what hydroelectric power does. There are gravitational anomalies, although they are not sufficient in magnitude to be useful. But the gravity gradient of the moon on different parts of the Earth can be used to generate electricity by tides:
Tidal power - Wikipedia
 

Yehren

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Even a satellite orbiting the earth experiences gravity, and is kept aloft by its high velocity which decays very slowly in orbit.

Technically, a satellite is falling toward the Earth, but it's horizontal speed is sufficient to continuously change "down" in such a way as to balance the forces into an orbit.
 

MattMooradian

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When I think of gravity, I think of Jesus and how he defied gravity. Walking on water defies the laws of gravity. Peter did it, too. Jesus claimed that they could defy gravity because of 'faith'. I believe we Christians should all be able to defy gravity (if we had faith). Why has the Church not evolved spiritually? Why cannot Christians 'move mountains' (defy gravity)? Certainly, Jesus seems to have expected us to be capable of such supernatural feats. "Nothing will be impossible to those who believe."
 

Yehren

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It certainly would be a more interesting world, what with all the mountains shifting around. But I think Jesus was quite aware that wasn't going to happen.