&#92;GRAVITY //  How does it works?
92597
Okay. Everything that has mass has gravity. You and I have our own innate gravity. So does your pencil, your computer, the air you breathe. \n\nIf you think of space-time (see Einstein) as the surface of a huge trampoline on which everything sits, then mass sits on top of that trampoline. But if you put a bowling ball on a trampoline, it puckers the surface and smaller things are drawn towards it, and it is drawn towards the smaller thing, if only a little bit. Similarly, if you roll a marble around the bowling ball, it will circle many times before it finally crashes into the bowling ball. (That how orbiting works.)\n\nThis is simplified, of course, but it helps to understand the concepts. If you are interested in the subject, I would recommend reading Billions and Billions by Carl Sagan.\n\nGood Luck!
961066
Your right - gravity is ludicrously weak. The force of gravity of the entire earth on your body is held back by the electrostatic force of a single layer of atoms in your shoes. Gravity is weaker by many orders of magnitude than every other force in the universe.\n\nAnd its a good job it is. Because otherwise we would not exist. \n\nHowever, we have no theory as yet that explains the relative magnitude of forces. It is considered one of the failings of the theories of physics - the parameters that determine the magnitude of the forces simply have to be fed into the equations from observation.
1155012
Newton's "law" of gravity is a mathematical description of the way bodies are observed to attract one another, based on many scientific experiments and observations. The gravitational equation says that the force of gravity is proportional to the product of the two masses (m1 and m2), and inversely proportional to the square of the distance (r) between their centers of mass. Mathematically speaking, \n\nF=Gm1m2 / r2, \n\nwhere G is called the Gravitational Constant. It has a value of 6.6726 x 10-11 m3 kg-1 s-2.
159387
First of all, IT'S GRAVITY BABY! Not really, but it does play a part. It's mostly the force of the wave, working with gravity to move that board at that certain speed.\nsomewhat like that
832488
In one way a trick question.\n\nGravity is the bending of the space-time continuum due to the presence of mass.  To create "gravity" you would have to create or accumulate mass.\n\n1)  You could convert energy into mass.\n\n2)  You could functionally increase the mass by rapid acceleration (as physical objects approach the velocity of light, their mass increases dramatically).\n\n3)  You could use a mechanical device (such as a spinning object) to create a virtual gravity (like centripetal force).\n\n4)  You could move closer to a massive object and be influenced by the gravity well of that object (satellite, planet, star or even black hole).\n\n5)  You could build a device based upon currently unknown technology that would bend space without any of the above.  This is the typical method used in "scifi stories."
46446
it derives from equation x=0.5*a*t^2+v*t+x0 (I know equation in metric, maybe 0.5 isn't correct) where a is accelarion and v is start speed and x0 is starting place, a has been replaced by -32 which is gravity acceleration and v is assumed 0 and x0 by s.\n weight doesn't have any effect if there is no air pressure(usually you can think so) , it is famous that Galileo Galilei famous Italian scientist proved it from top of Pizza building with 2 different balls, they reach to the ground together.\nThe effect of air is a little complicated, it depends on the way you simulate it but usually it slow down the accelerate till the point that speed remains constant. Depends on the density of air and the shape of thing.\n there isn't any equation  which describes such a phenomena, you must solve the problem case by case.\nIf you like dynamic and static physics I recommend you The physics by Holliday, its a good book.
208514
Yes, anything with mass generates gravity.  Gravity will only effect things which have mass, so the fact that you are stuck down means you have mass, and thus gravity.
919025
Let's clear up our terms a little bit.\n\nGravity only generally occurs between things of mass.  And it is pretty much independant of what the mass is doing.  And I say pretty much because there are things that can create or destroy mass... but in a general sense it all comes down to the mass.\n\nNow, as astronomical bodies form, they tend to get a spin.  Because of the conservation of angular momentum, things that suck up more mass tend to have more spin than others.  These are, however, tendancies, NOT necessities.\n\nCase in point - the Earth.  Because of the tides, the spin of the Earth is slowing down.  We used to have twelve-hour days millions and millions of years ago, but now they're twice as long.  Has this affected the force of gravity?  Not a bit.  The same mass is present, and it's causing the same amount of gravity.\n\nWhat your friend may be confused by is what is sometimes called centrifugal force (a physicist would probably just call it inertia, though).  Although gravity pulls us down to the centre of the Earth, the motion of spin carries us away from the centre, counteracting gravity.  This means if you take a tool to measure gravity near the equator, you'll get a lower reading then you will when you measure it at the axis.  The force of gravity hasn't changed at all, but the spin is creating another force that is mitigating gravity's effects.  On Earth, this force is pretty small, but it's concievable that it could amount to a huge amount on a fast-enough spinning object... say, a space station with almost no gravity, but which was spinning fast to simulate gravity but pulling out instead of in.\n\nSo in a literal sense, you are completely right.  Gravity has ONLY to do with mass (well, mass and distance).  In a squishier sense, your friend is sort of right, in that spin can change the APPARENT force of gravity in local areas and that objects with large gravities also tend to have large spins.\n\nHope that helps!
1130182
Um... I think maybe pull... if something is rotating/turning it is creating it's own little gravity field (I think!) therefore making it easier to pull.  I'm no scientist but this is an educated guess.
304127
Well, I can see and measure the _effects_ of something that we call gravity, but as to there being a substance/force/action called gravity existing, since we can only measure it indirectly and not yet generate or manipulate it*, then scientifically speaking, there is no reason to believe in gravity. \n\n * Although NASA has tried successfully - See reference.
1093836
Centrifugal force and gravity.
1049976
Another string theory, \nG – hmm, \nwhy not then a G-string theory?\n\n\nCurios question it is. Let us as assume that you will put a geosynchronous satellite at about 300km from the center of the Earth. Since it is a geosynchronous satellite it will stay with the same point on the Earth say over your house.  The air resistance will be minimum as I‘ll assume that the planets atmosphere stays with the planet. Here are some numbers:\n\nEarth rotates at Ve= 1,700 km/hour (diameter ~13,000 km)\nOur geosynchronous satellite Vs= ~40,000 km/hour (at 300,000 km above center of the Earth)\nThis was just to show off, now let us do some serous computation.\n\nAnd the weight of the string say at 1gm/meter will weigh …. will weigh about 126.87 kg by employing the inverse square law of gravity.  (These were very tough computations).\nThat will apply a force of about 1,300 N on that satellite.  Why apply a steady pull? The weight of the string will bring the satellite down.\n\nThe daunting question is how are we are going to attach one end of that string to the satellite in the first place and then getting the other end to your house ;)? Or perhaps…\n\nThanks for all the fish
881123
I thought it meant how severe something was but I am not finding anything to back me up on that. I think, from looking on the internet, people use it for the word gravity. No other definition for any such word - just suggestions to the other forms that relate to gravity.
1034782
The word 'gravity' comes from the Latin word "gravitas", meaning 'weight'.  Gravity is the tendency of objects with mass to accelerate toward each other. Gravitation is one of the four fundamental interactions in nature, the other three being the electromagnetic force, the weak nuclear force, and the strong nuclear force. Gravitation is the weakest of these interactions, but acts over great distances and is always attractive.\n\nCheck these links.
58372
the formula you need is Fg=Gm1m2/r^2.  so just plug in. G is the universal gravitational constant. so it's:\n(6.673 x 10^-11)(70)(70)/(1)^2 = 3.327 x 10^-7 N\n\nas you can see, this is negligable because people are not big enough to create a substancial gravitational force.
1081934
There are too many formulas to calculate that answer. You have to take in account for example, position of object to find potential energy, mass and the weight due to the gravitational force, also Force that is going to be exerted the object and the amount of that energy that will be lost. SO it is a lot to  find that out. But their is not one formula for it. Sorry, But if you do find out Let me know.
630060
Speed of.. gravity? :S