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just curious if anyone can explain these errors that many people are aware of when it comes to the theory of gravity
number 1. the way gravity reads, scientists have you think that objects of larger mass would have more of a gravitational pull then objects of smaller mass. so tell me how this makes sense
when we look at the sun we see the earth orbiting the sun, and the moon obriting the earth. if gravity were true, shouldnt our moon be orbiting the sun??? oh better yet, how come a planet way out in the distance such as neptune will orbit the sun, yet its moons will not orbit the sun??? something is wrong here, even at thise immense distances the moons will orbit the planets and not the sun, yet the suns "gravity" is strong enough supposedly to keep the planets in orbit.
Its moons are far closer to Neptune than they are to the sun. Therefore, Neptune's moons will orbit Neptune, even if the sun is a lot larger than Neptune, because Neptune's moons are far closer to Neptune.
The moon is a lot closer to earth than it is to the sun.
number 2. why is it, only planets have orbits?? you could put a space shuttle in outter space and a astronaut will not orbit it. you could put the smallest pebbble into outter space and it will not orbit the space shuttle. why is this???? if gravity were true then surely such small objects would orbit larger ones, especially in space
That would work...........
If space shuttles were as big as planets.
number 3. on earth we see things that defy "gravity" on a daily basis. birds and airplanes for example. are you going to tell me that the gravity of the sun is strong enough to keep PLUTo in orbit but not an airplane or a little bird??????
They don't actually "defy" gravity. They merely push up with more force than gravity pulls them down.
number 4. scientists dont know how gravity works. or what it really is, and even then we see anaomolies in space that defy gravity
Source?
so my point is that gravity(like other scientifist "tHeories" is very on shaky grounds. it doesnt have the evidnece to back it up, and when examined critically it falls under the pressure(no pun intended )
show me a pebble that orbits a mountain or a bird that orbits the earth and then gravity will make sense.[/quote]
Oh dear... this is like "show me a cat giving birth to a dog."
A pebble won't orbit a mountain, because the earth is a lot bigger than the mountain; plus it's actually close to the pebble, unlike Neptune's moons and the sun.
or better yet just show me how gravity works(if it works at all) and then maybe it will be more than just a theory
So, to start with your questions, the force between two objects will depend a lot on the distance.
The mass of the sun might be a lot higher than the mass of earth and moon.... but it is also a lot farther away. It is so much farther away that the force of gravity between earth and moon is higher than between moon and sun.
That is the reason why the moon orbits earth, and not the sun.
if this is true, then what keeps the moon from crashing into earth, or pluto from crashing into the sun. i've also heard that pluto is smaller than its moon, if this is true then why doesnt pluto orbit the moon??? and why does pluto have an oddly shaped orbit ????
Question 3: I´m not sure how you think birds and airplanes defy gravity.... do you meant because they don´t fall to the ground or because they don´t start to orbit earth?
Both can be easily answered. Flying things stay aloft, because they exert a force that counters the force of gravity.
Imagine it as a kind of rope-pulling game. If both teams pull with the same force, they won´t move, no matter how hard they are pulling. Now switch that analogy to the vertical.
something is wrong here.....hmmm
the earth is supposedly exertig a force that keeps the moon in orbit, are you telling me that a little bird is capable of dispelling that force and the moon cant???(remember the bird is closer to the earth than the moon so it would have to be stronger3)
That is only partially correct. Scientists do know quite well how gravity works. What it really IS is another question, and that is indeed still not answered to satisfaction. But that doesn´t keep gravity from working, being observed and calculated.
if objects of heavy mass have gravity, what causes it? what is gravity??
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.
if this is true, then what keeps the moon from crashing into earth, or pluto from crashing into the sun. i've also heard that pluto is smaller than its moon, if this is true then why doesnt pluto orbit the moon??? and why does pluto have an oddly shaped orbit ????
Speed. There is not only a force directed by the sun on the earth or pluto, or the earth on the moon, but also the force of the orbital movement of the planets/moon. Like a centrifuge. Water also stays into a bucket when you swing it around real fast, despite gravity acting on it.
[quote]something is wrong here.....hmmm
the earth is supposedly exertig a force that keeps the moon in orbit, are you telling me that a little bird is capable of dispelling that force and the moon cant???(remember the bird is closer to the earth than the moon so it would have to be stronger3)[=/quote] I can't make head nor tails of this. A bird creates an upward force with it's wings that counteracts the downward force of gravity. It does not 'dispell' gravity, it just provides enough force in the opposite direction to be able to keep flying. What so hard to understand about that?
if objects of heavy mass have gravity, what causes it? what is gravity??
We don't know exactly. Why is that a problem?
__________________
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.
if this is true, then what keeps the moon from crashing into earth, or pluto from crashing into the sun. i've also heard that pluto is smaller than its moon, if this is true then why doesnt pluto orbit the moon??? and why does pluto have an oddly shaped orbit ????
Eri explained it quite well.
The reason why the marble does not fall into the bowl is (mathematically) the same as why the moon does not crash into the earth (or why satelites stay where they are).
If you had to motionless objects, gravity would pull them together and they would crash.
But the moon is not motionless. It moves around the earth. There is another physical force acting on objects moving in circles, called centrifugal force. You can experience in a carussel. This force drives the object outward from the center of the circle. Its size depends on the radius of the orbit and the speed of the object.
Now if the centrifugal force is of equal site as the pull of gravity, the object will neither go outward not inward, but stay in a circular orbit.
something is wrong here.....hmmm
the earth is supposedly exertig a force that keeps the moon in orbit, are you telling me that a little bird is capable of dispelling that force and the moon cant???(remember the bird is closer to the earth than the moon so it would have to be stronger3)
You just observed that the moon does NOT crash into the earth... so why would a bird?
You can, by using the given formula, calculare the size of the gravitational pull on a bird on earth. That is the force that needs to be overcome.
Then you could look up the relevant formulas from Aerodynamics and see how much lifting force can be achived by certain wing-structures.
if objects of heavy mass have gravity, what causes it? what is gravity??
Every object of mass "has" gravity. It is part of having mass. It is an attibute of physical objects, just as the same object as width and height. You wouldn´t ask what causes these either, would you?
Now what gravity IS... we don´t know. We know how it expresses itself, but not why.
__________________ 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!
Well,the answer to this one is easy,,,,
God started the spinning as he stretched out the universe amongst time and space,,and its been spinning ever since.
How do I know this?
Because I just do,if you want proof,go ask God yourself.
Or you know, a creature-that-can't-be-named-anymore-because-of-the-forum-rules and that can only be killed by acid or fire..
We call it "Poe's Law" now.
__________________
Don't talk like one of them. You're not! Even if you'd like to be.
To them, you're just a freak, like me! They need you right now, but when they don't, they'll cast you out, like a leper! You see, their morals, their code, it's a bad joke. Dropped at the first sign of trouble. They're only as good as the world allows them to be. I'll show you. When the chips are down, these... these civilized people, they'll eat each other.
See, I'm not a monster. I'm just ahead of the curve.
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Or you know, a creature-that-can't-be-named-anymore-because-of-the-forum-rules and that can only be killed by acid or fire..
Not necessarily Mystman. Go to America and spend there half a year, talking with other Americans about there educational system. After that, you will realize that this kind of ignorance about science is not necessarily faked, but truly present if you neglect your schoolsystem long enough.
Remember that the next time a bunch of students go onto the streets to protest against further cuts in education and join them. That level of ignorance is what we're trying to prevent.
__________________
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.
)
I can't make head nor tails of this. A bird creates an upward force with it's wings that counteracts the downward force of gravity. It does not 'dispell' gravity, it just provides enough force in the opposite direction to be able to keep flying. What so hard to understand about that?
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