why dose earth have gravity ?

Answer 1

In that the force of gravity performs work, it must have an energy source. Meaning there must be an expenditure of energy in some manner in order for it to continually perform work through time. This is sorta like your car needing additional gas as it drives down the road. One gallon is not sufficient for the life of the car.

The energy source being expended within our planet is its heat energy. Our planet must expend 0.00444 kg. per sec of equivalent mass converted into gravitons to maintain everything where it should be. Our sun expends 665 lbs per sec in order for the planets to remain where they should be.

The equation for a gravitational field is c2 = E/m, which describes it as either a field of physical time or what we would call a field of gravity. The energy propagated appears to be that of "h" (Plank's constant), a value so small that it is unable to be distinguished by observation.

As this form of energy passes through our planet, it attracts the heat energy within it toward its center as well as the mass. Were it not for this beneficial force acting as it does our planet would soon be the same temperature throughout.

Answer 2

All objects have gravity, the denser the object the more gravity acts upon it. Density is the amount and type of atoms an object has. For instance a tennis ball is far less dense than a ball of the same size made of lead due to the fact that the lead ball would have many more atoms. Gravity is however a pretty weak force. You can easily overcome gravity, just throw the tennis ball into the air. You have defeated gravity. Isaac Newton did not "discover" gravity, he discovered the means to measure it. Suprisingly Newton never did understand how it actually worked. Albert Einstein put forth the theory that gravity is a warp in the space - time continuum or fabric. A trampoline is probably the most common example or even a bed can be used. Place a ball on the edge of a trampoline or a bed then stand on the trampoline or bed and the ball will roll towards you. Your density(body weight) caused a warping of the space - time fabric (bed or trampoline) causing artificial gravity that makes the ball roll toward you. When scientist started looking into the structure of atoms themselves they found that Einsteins theories did not work and that gravity was very weak on the atomic level. It is a force that works over great distances and great masses. The result of Einstein's theories not working at the atomic level led to the creation of quantum mechanics. So now we have do differing descriptions of the universe and the necessity to have ony one theory is what the string theory is all about.

Answer 3

First of all, dump those answers about magnetism and Earth's molten core causing gravity. That's all a load of crap!

Any object with mass has gravity. Earth has mass, therefore it has gravity. Einstein said that gravity is actually a distortion of space itself caused (..somehow) by mass. Imagine a thin sheet of rubber with a bowling ball sitting on it. The bowling ball causes a distortion in the rubber sheet. That's similar to how mass (..the bowling ball) distorts space (..the rubber sheet). This isn't just theory either--it's been proven true by countless scientific experiments. How or why mass does this to space isn't understood at this time because we don't understand everything about mass.

Answer 4

all object that have mass have an attraction to one another. That attraction is gravity. The two factors that affect force of gravity are mass and distance between the objects.

The earth is massive and we are close to it so it has a large amount of attraction. On the moon, the moon is much less massive so it has a much smaller attraction. That is why you would weigh less on the moon than on the earth.

Hope this helps

Answer 5

Haven't a clue why earth DOSE have gravity. But if you had asked why it DOES have gravity I could have given you the correct answer.

How fortunate this wasn't an English homework question.

Answer 6

Every planetary body, including the Earth, is surrounded by its own gravitational field, which exerts an attractive force on any object. This can be due to Magnetic components created by the earth's core.

Answer 7

every thing have gravity , even yourself , the gravity of the
body = density / volume
gravity of the black halls is height because of high density and low volume .

Answer 8

everything with mass has gravity

Answer 9

The earth's core is molten liquid,which like a giant magnet.

Answer 10

It's physics. When you attach a plate to a string, put sth on the plate and swing really quikly, the thing will not drop from the plate. it's the same as the eath. the plate is the earth, you are the sun, and we are the "thing". earth revolves around the sun, so we do not drop off.