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I don't know he has been riffing on this gravity theme for some time now.
We don't want him to go all Dad and tedious on us .
Bit late now!
Originally Posted by Baggins
But still the best parody on this board by a country mile
Which is a striking commentary on the parodies of this board more than a commentary on the skill of Angry Notice. I think he lost his edge weeks ago and has been rather old hat ever since.
__________________ Every "good" scientific theory is a prohibition: it forbids certain things to happen. The more a theory forbids, the better it is. - Popper, Sir Karl
Science does not deal in metaphysics. The existence or non-existence of God is a metaphysical question, and as such science neither attempts to prove or disprove God.
The Moon doesn't crash into the Earth because it's orbiting at a constant speed. Another forumla you might find useful is G M m /r^2 = m v^2 /r, which tells us how fast (v) an object (of mass m) has to move to stay in a circular orbit at a distance (r) from an object (M). If the Moon's velocity suddenly changed without it moving closer or further away, it might fly away from the Earth or in towards it. But most small changes in velocity even themselves out without catastrophie. Imagine taking a marble and spinning it in a round bowl - if you keep it going at a constant speed, it will circle the edge of the bowl without falling in. Same idea.
but a marble will eventually lose its spin and fall into the bowl. why doesnt this happen with the planets or the moons
Originally Posted by Tomk80
We don't know exactly. Why is that a problem?
because if no one knows what it is, or what causes gravity, how can you be expected to be taken seriously when trying to explain the "laws" of it????
thats like me saying, "i dont know what causes lions to eat meat, or why lions exist, but we do know about lions". it doesnt work.
another problem with gravity, if the big bang were true wouldnt everything remain condensed and not be flying further into space????
but a marble will eventually lose its spin and fall into the bowl. why doesnt this happen with the planets or the moons
Friction. The marble loses energy, and that means, it loses speed.
because if no one knows what it is, or what causes gravity, how can you be expected to be taken seriously when trying to explain the "laws" of it????
thats like me saying, "i dont know what causes lions to eat meat, or why lions exist, but we do know about lions". it doesnt work.
What will happen when you don´t know what causes lions to eat meat or why lions exist.... and you happen to stumble over a hungry lion.
The lion will eat the meat.
You don´t have to solve complex philosophical questions to know that.
another problem with gravity, if the big bang were true wouldnt everything remain condensed and not be flying further into space????
No. Gravity is but one force amongst many.
__________________ Hier sitz´ich, forme Menschen
Nach meinem Bilde,
Ein Geschlecht, das mir gleich sei,
Zu leiden, zu weinen,
Zu genießen und zu freuen sich
Und dein nicht zu achten,
Wie ich!
but a marble will eventually lose its spin and fall into the bowl. why doesnt this happen with the planets or the moons
And the moon will too, eventually. However, marbles get a lot of counteracting force by friction of the air and of the ground. As the moon drifts in a vacuum, it does not encounter such friction, so it does not slow down, or at least doesn't slow down as fast.
because if no one knows what it is, or what causes gravity, how can you be expected to be taken seriously when trying to explain the "laws" of it????
thats like me saying, "i dont know what causes lions to eat meat, or why lions exist, but we do know about lions". it doesnt work.
Even if we do not know why lions eat meat, we can observe that they do it. We can observe how the moon orbits and how the planets orbit, and derive mathematical formulas for this. From this we can derive laws of gravity. We don't need to know how gravity works specifically for that.
To observe how something works, and why something works that way specifically are two different things. We can often observe how something acts, without knowing exactly why that happens.
another problem with gravity, if the big bang were true wouldnt everything remain condensed and not be flying further into space????
No, because the force by heat etc in the first moment of the big bang is larger than the gravitational force.
__________________
Tom
'What luck for rulers, that men do not think.'
-Ascribed to Adolf Hitler-
`Contrariwise,' continued Tweedledee, `if it was so, it might be; and if it were so, it would be; but as it isn't, it ain't. That's logic.'
-Through the Looking Glas by Lewis Caroll-
Statistics are like a bikini. What they reveal is suggestive, but what they conceal is vital.
The marble will fall into the bowl if you don't keep it moving at a constant velocity. But while the marble needs you to keep it spinning, planets don't - they don't encounter enough friction to change their path or speed. They can keep going for a long time.
We don't claim to know everything about anything, but we do know quite a bit. You can't ever know everything there is to know. But until we think we understand something perfectly, does that stop us from using it at all? Of course not. We know a lot more about computing technology than we did 50 years ago, but by applying what we knew we found out more.
As for the Big Bang - it expanded. We're not sure why yet, but we know for a fact it did. To see why we know this, check wikipedia for 'Hubble's Law' and 'WMAP'.
Linear Mode
