why can't we use gravity for energy?

You mean that hydroelectric power is not fundamentally gravitational? Wow, you need to write a paper and win a Nobel Prize for over-turning the Laws of Physics!

You are looking for laws to convert to energy.

Or maybe it is "sources"...

I am blinded by your brilliance.

Here I thought energy can be neither created nor destroyed.

You will need to either sober up and stop engaging in magical thinking or go back to reading your fantasy and magic fairy tails. Your choice.

You cannot easily use gravity for energy production because you first need to apply an opposite force to get an object away from the source of gravity, which takes an amount of energy.

Well, earth only has one gravitational pull. Just as an example, when you spin a wheel, it stops eventually because gravity is acting on it. I can't think of any way of using gravity alone to convert into consumable energy.

Gravity won't work because first you have to overcome it. In theory, it will take you as much energy as you going to create. Throw in a few inefficiencies and you have a nett loss.

It would be simpler if we melted down all the body fat from obese people. Win:win

To be greater clean: mild is a factor of the ability yet not absolute = power mass is a factor of the ability yet not absolute = power. To help this you have the formula of power : E = mc^2 m= mass , c= velocity of light. Now, you gravity may well be a style of power, you could call it: Gravitational skill power Gravitational skill power is power an merchandise possesses because of the fact of its place in a gravitational field. the main consumer-friendly use of gravitational skill power is for an merchandise close to the outdoors of the Earth the place the gravitational acceleration may well be assumed to be consistent at approximately 9.8 m/s2. because of the fact the 0 of gravitational skill power may well be chosen at any factor (like the call of the 0 of a coordinate gadget), the aptitude power at a top h above that factor is comparable to the artwork which may well be required to develop the article to that top without internet substitute in kinetic power. because of the fact the rigidity required to develop it rather is comparable to its weight, it follows that the gravitational skill power is comparable to its weight circumstances the top to which it rather is lifted. in greater less difficult words: PE (gravitational) = Weight x top = mgh.