What is the source of energy forming earth's gravity?

Question

It requires energy to perform work. In that the force of gravity continously performs work, what is the energy source? A person cannot say that it is due to mass only, because work is being continuously performed, forth coming energy must be being expended in order to do this. E = mc2, m = E/c2, c2 = E/m?

Answer 1

I know this is WRONG, but i like to think of it as:
every single molecule that makes up the earth puts out a tiny force. similar to the forces that make opposite ends of a magnet attract, the molecule exhibits a tiny tiny attracting force. when you add up all the forces each molecule in the earth makes we get gravity. since we are close to these molecules, the force is pretty strong, but the further we get from the earth, the less we feel the gravity. that's why we float in space. but even if you can't feel it up in space, say near our orbiting moon, the gravity IS there. that's why our moon orbits us instead of leaving. earths force of gravity pulls the moon around us like a rope.

Answer 2

My 1st answer is according to newton's universal law of gravity all objects attract each other. The more the mass the more the attraction will be. My 2nd answer is our earth itself acts as a magnet because of the lighting which hits the surface every minute due to which the earth acts as a electromagnet. The energy might be coming from this electromagnetism due to lightning.

Answer 3

Think about a cloth having grids of lines printed across it. and u put a ball on it. the centre of the cloth will be depressed by the weight of the ball and the grid lines will appear to be curved. The heavier the ball, steeper will be the curvature of grid lines. This curvature is nothing but gravity of that ball with respect to the cloth. So, a body curves the space and time around it. By virtue of its "mass" only. The space-time continum is curved around it. The curvature of this curve is called gravity. Now, If u put a lighter ball on the cloth, u'll find it is moving towards the heavier ball at the centre. Higher the mass of the center ball steeper 'll be the curve and the lighter ball will move faster towards it (means the body at center has higher gravity! only because it has higher mass! nothing else!)

Answer 4

Gravity is not energy in the normal sense, it is the displacement of space/time by mass. Meaning that an object that has weight causes the space that it occupies to curve around it. It is this phenomina that creates what we experience as gravity.

Answer 5

"Gravity" exactly means "weightyness" or "weight". Therefore, Earth's gravity means Earth's weight. Weight is the amount of gravity (weight) acting on a body but its mass is its content of potential energy. Your weight may be 60 kg on earth but only 10 kg on moon. What about your mass? Weight = Mass x Acceleration due to gravity i.e. w = mg. If your weight is about 60 kg wt., not exactly,
mg = 60 kg
m = 60 / g

g = 9.8 m / s*s

m = 60 / 9.8
m = 6.1224489795918367346938775510204 kg !!!

Your mass is just about 6 kg !!!

Weight varies but mass does not. Weight requires a device like weight - machine but we never worry about our mass. Therefore, it is not the energy that pulls us to the earth's gravity itself but it is its virtue of its potential energy content. It is just by a simple logic that high potential energy at opposite pole attracts not pulls low potential energy. That's all !!!

Answer 6

You're using the wrong formula. Think about kinetic energy

KE= 1/2 MV^2 Now you're not dependent upon the speed of light squared to achieve enough energy to produce a weak magnetic field.

Answer 7

I think the answer--It is bcause iron and nickel is present in the earth's core whis is responsible for the earth's gravity.