- #1
Nexus555
- 58
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Hey guys. I know what gravity is and everything, but I was wondering if this would be a good way to look at gravity in a physical sense (even though you can't nessesarily "see" gravity, but observe it's effects.)
Lets say you have a planet, or star. Since there is a lot of mass in the planet/star or whatever, the planet bends space. Would this be a good analogy since gravity attracts?
I find it very strange how gravity attracts objects. It seems somewhat logical to think if an object is in space, it is pressing "down" on the "fabric" of space. The downward push causes gravity, therefore attraction to the object with suficient mass.
I guess a good example would be this: Let's say you have a bed sheet that represents space/time and a baseball that represents a planet. Now if you stretch the sheet out somewhat tightly with 2 people and place the ball on the sheet, the ball causes the sheet to bend downwards a little bit. Now if you have let's say a marble, and place it on the sheet, if it's close enough, it will "attract" (or since gravity exists on earth, travel downward to the lowest possible point.) However if it's not close enough to the funnel, it stands still, and also causes a small amount of indention to the sheet itself. I know this analogy is flawd in the sense it's on earth, but I'm just trying to generalize and make sense of it!
I'm familiar with Newton's laws and relativity and all, I just want to know a good way to picture it in my head. Please try to verify this analogy or enlighten me! Thanks guys
Lets say you have a planet, or star. Since there is a lot of mass in the planet/star or whatever, the planet bends space. Would this be a good analogy since gravity attracts?
I find it very strange how gravity attracts objects. It seems somewhat logical to think if an object is in space, it is pressing "down" on the "fabric" of space. The downward push causes gravity, therefore attraction to the object with suficient mass.
I guess a good example would be this: Let's say you have a bed sheet that represents space/time and a baseball that represents a planet. Now if you stretch the sheet out somewhat tightly with 2 people and place the ball on the sheet, the ball causes the sheet to bend downwards a little bit. Now if you have let's say a marble, and place it on the sheet, if it's close enough, it will "attract" (or since gravity exists on earth, travel downward to the lowest possible point.) However if it's not close enough to the funnel, it stands still, and also causes a small amount of indention to the sheet itself. I know this analogy is flawd in the sense it's on earth, but I'm just trying to generalize and make sense of it!
I'm familiar with Newton's laws and relativity and all, I just want to know a good way to picture it in my head. Please try to verify this analogy or enlighten me! Thanks guys
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