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| Thread: A hoax called gravity. |  This thread is pages long: 1 2 3 4 5 · «PREV / NEXT» |
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Corribus
Hero of Order
The Abyss Staring Back at You
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posted June 30, 2008 04:03 PM |
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The volume surrounding the alleged solid core of jupiter is theorized to be occupied predominantly by liquid metallic hydrogen, which is a form of degenerate matter.
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I'm sick of following my dreams. I'm just going to ask them where they're goin', and hook up with them later. -Mitch Hedberg
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Minion
Legendary Hero
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posted June 30, 2008 04:07 PM |
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Quote:
But you don't have sufficient pressure to make degenerous gasses in Jupiter, do you?
Yes there is enough pressure to make Hydrogen denegerate, metallic. It is quite impossible to imagine the vastness of Jupiter... But if you know about the "red eye" of Jupiter, the raging storm that continuously circles the planet, then imagine that the storms diameter alone is bigger than Earths diameter.
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"These friends probably started using condoms after having produced the most optimum amount of offsprings. Kudos to them for showing at least some restraint" - Tsar-ivor
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Celfious
Promising
Legendary Hero
From earth
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posted June 30, 2008 08:27 PM |
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So is my theory found invalid or no? lol
Gravity is only a possible explanation to whats really going on with the up and down thing.
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What are you up to
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alcibiades
Honorable
Undefeatable Hero
of Gold Dragons
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posted July 01, 2008 08:53 AM |
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Gravity is only a theory, but so far, we don't have any evidence* to suggest that it's wrong.
* At least on the simple, "earthly" classical level.
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TheDeath
Responsible
Undefeatable Hero
with serious business
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posted July 01, 2008 01:53 PM |
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If there wouldn't be gravity, we could lift objects without effort?
If so, why are heavy objects harder to lift? Air resistance?
maybe I'm missing something here
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alcibiades
Honorable
Undefeatable Hero
of Gold Dragons
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posted July 01, 2008 01:58 PM |
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Maybe it is so, because God made it so? 
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What will happen now?
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TheDeath
Responsible
Undefeatable Hero
with serious business
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posted July 01, 2008 02:35 PM |
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There isn't any explanation with gravity? 
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Minion
Legendary Hero
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posted July 01, 2008 03:15 PM |
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Edited by Minion at 15:15, 01 Jul 2008.
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Quote:
If there wouldn't be gravity, we could lift objects without effort?
If so, why are heavy objects harder to lift? Air resistance?
maybe I'm missing something here
Objects always have the same mass, no matter if there is strong gravitational field around or not. Weight is mass affected by gravity, and that will always change with its location in the universe.
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"These friends probably started using condoms after having produced the most optimum amount of offsprings. Kudos to them for showing at least some restraint" - Tsar-ivor
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TheDeath
Responsible
Undefeatable Hero
with serious business
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posted July 01, 2008 03:20 PM |
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But if there's no gravity, we don't 'feel' the object pushing downwards therefore easy to lift, no?
Why are heavy objects hard to lift -- because they don't fall quicker than light objects, since there is hardly air resistance when the object is in my hands trying to lift it?
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Minion
Legendary Hero
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posted July 01, 2008 03:30 PM |
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Well there wouldn't be any air at all, because all gasses would have flown to space if the gravity on Earth didn't exist 
The answer is that you need to use Force to give an object with Mass momentum, movement. As a human you have limited Force, so massive objects are more "resistant" to your Force that is trying to move/lift it.
The formula is simly F=ma.
Force is a push or pull that can cause an object with mass to accelerate.
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"These friends probably started using condoms after having produced the most optimum amount of offsprings. Kudos to them for showing at least some restraint" - Tsar-ivor
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TheDeath
Responsible
Undefeatable Hero
with serious business
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posted July 01, 2008 03:40 PM |
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I meant, when you hold up a desk it's much harder to hold than a stick -- even though the 'speed' is 0 (since you hold it up), but because of gravity it 'pushes' itself down so to speak.
But again, if heavier objects don't fall faster (apart from less air resistance), then why are they heavier when you hold them up?
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mvassilev
Responsible
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posted July 01, 2008 04:02 PM |
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TheDeath
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posted July 01, 2008 04:17 PM |
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You said that heavy objects don't fall faster than light objects in a vacuum. Therefore, mass has nothing to do with 'gravity' pull, am I right?
In space, you don't need to 'hold' an object -- it already stands suspended! You will not feel any kind of force on your hands.
My question was, if heavier objects don't fall faster than light objects, why are they hard to hold up? Why is there a greater force pushing down against your hands?
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mvassilev
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Undefeatable Hero
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posted July 01, 2008 04:28 PM |
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Mass does have something to do with gravity pull: it determines weight. And they're harder to move because of their weight. Weight is a force acting on the object, and you have to overcome that force in order to lift it.
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Eccentric Opinion
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TheDeath
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posted July 01, 2008 04:44 PM |
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So basically, heavy objects fall faster because of weight (greater force applied), not only air resistance
either that or heavy objects are not harder to hold than light objects, which is I think quite false
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mvassilev
Responsible
Undefeatable Hero
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posted July 01, 2008 04:49 PM |
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Quote:
So basically, heavy objects fall faster because of weight (greater force applied), not only air resistance
No, they don't. The force on them is constant - F = g*m. The force varies with mass (as m is a variable). The acceleration doesn't - it's always g (on Earth, assuming no air resistance).
Now, if you're going to pick an object up, you have to overcome that force, and the force varies with mass. The acceleration (and, therefore, the speed) is not affected by mass, though.
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Eccentric Opinion
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TheDeath
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with serious business
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posted July 01, 2008 04:52 PM |
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Quote:
So basically, heavy objects fall faster because of weight (greater force applied), not only air resistance
No, they don't. The force on them is constant - F = g*m. The force varies with mass (as m is a variable). The acceleration doesn't - it's always g (on Earth, assuming no air resistance).
A force in a certain way will always accelerate the object. Because it is applied again, and again, and again. For me it sounds weird to have a force and not accelerate 
Quote:
Now, if you're going to pick an object up, you have to overcome that force, and the force varies with mass. The acceleration (and, therefore, the speed) is not affected by mass, though.
I was talking about holding an object up, not picking it up -- holding as in "not letting it go down".
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mvassilev
Responsible
Undefeatable Hero
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posted July 01, 2008 05:03 PM |
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Quote:
A force in a certain way will always accelerate the object.
It is accelerating the object. It is accelerating the object at acceleration g, which is approximately 9.8 m/s^2. But the only way to increase the force of gravity is to increase the mass, which won't change the acceleration.
Let us say you have an object that has a mass of 1 kg. You drop it. The force acting on it would be 9.8 N (Newtons), since 9.8*1 = 9.8. In a second, its speed would be 9.8 m/s. In two seconds, its speed would be 19.6 m/s. And so on.
Let us say you have an object that has a mass of 2 kg. You drop it. The force acting on it would be 19.6 N, since 9.8*2 = 19.6. In a second, its speed would be 9.8 m/s. In two seconds, its speed would be 19.6 m/s. And so on.
See, the force of gravity increases when you increase the mass, but the acceleration doesn't.
Quote:
I was talking about holding an object up, not picking it up -- holding as in "not letting it go down".
Then the force you exert upon the object has to be equal to the force of gravity.
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Eccentric Opinion
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TheDeath
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posted July 01, 2008 05:11 PM |
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I understand your example but I can't make sense of it.
If a car has a certain force applied on it's direction, it will accelerate. The higher the force, the higher the acceleration too. It seems weird with gravity
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mvassilev
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Undefeatable Hero
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posted July 01, 2008 05:19 PM |
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*sigh*
There are two ways to change the magnitude of a force: changing the mass or changing the acceleration. When you're talking about a car accelerating, the force acting on it increases, thus increasing the acceleration, since the mass of the car stays virtually the same. When you're talking about gravity, though, you can't accelerate any slower or faster than g (assuming no air resistance). The only way you can increase the force is to increase the mass.
Look at it like this. You are exerting a force of 50 N. With that 50 N, you can cause an object that has a mass of 1 kg to accelerate at 50 m/s^2, a 2 kg object at 25 m/s^2, a 50 kg object at 1 m/s^2, a 100 kg object at 0.5 m/s^2, and so on.
If the acceleration is constant, you can only increase the force by increasing the mass. If the mass is constant, you can only increase the force by increasing the acceleration. If neither is constant, then you can increase either or both (as long as you don't decrease the other).
The acceleration and mass are independent of each other.
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Eccentric Opinion
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