[ 3 / biz / cgl / ck / diy / fa / ic / jp / lit / sci / vr / vt ] [ index / top / reports ] [ become a patron ] [ status ]
2023-11: Warosu is now out of extended maintenance.

/sci/ - Science & Math

View post   
File: 1.98 MB, 355x363, 1275539144881.gif [View same] [iqdb] [saucenao] [google]
1554107 No.1554107 [Reply] [Original]

Dear /sci/,

Where does the energy in the work done by gravity come from?

>> No.1554115

Where does the energy in the work done by Kinetic Energy come from?

>> No.1554116

From other universes, duh.

>> No.1554119

That energy came from when he walked up the stairs, it's called gravitational potential. That energy came from his breakfast, that energy came from plants, which came from the sun, which came from god. So god did that to him.

>> No.1554121

gravity uses the potential energy of the objects it attract.

>> No.1554123

Source of gif, that's pretty badass

>> No.1554137

On a celestial scale: it would have come from the big bang throwing bodies apart and distancing each other creating the potential for stored energy. Such would indicate the existence of energy before they were distanced.

On a human scale: people or external forces (eg: the sun) elevated particles and did work to separate them, giving them the potential energy. Hence it comes from external actors.

>> No.1554167

If you drop a ball, you had to put energy into it first by lifting it up off the ground, I suspect plateary-scale gravity is some convoluted form of that.

1) convert mass to energy
2) energy moves away and recondenses into matter
3) ??? (gravity)
4) FREE ENERGY

>> No.1554177

But what of matter/antimatter pair production? Suppose one of the pair gets sucked into a black hole, and the other now exerts a gravitational attraction on nearby things, yet energy wasn't put into putting it into a position of gravitational potential

>> No.1554230

>>1554137
The big bang did not throw masses apart. It was an expansion of space which contained energy. The energy coalesced into evenly distributed mass. Clumps of mass were drawn together gravitationally. That energy didn't come from anywhere, but rather was borrowed from the gravitational field which is a potential field, which is negative energy.

As an example, take an object that is falling to earth from far away. The kinetic energy that the object develops by falling to earth is equal to the increase of the gravitational field that arises by adding the object's mass to earth's mass -- by having those to objects closer together.

So you've added kinetic energy, and you've added an equal amount of negative energy. The negative energy, being the gravitational field.

As you can see, this is a cumulative and escalating effect, an is very related to the reason for inflation and the accelerating expansion of the universe

>> No.1554238

>>1554230
Or, to put it another way, it is the energy deficit caused by operation of gravity that leads to more gravity.

>> No.1554343

>>1554107

Mass accumulation of strong nuclear force

>> No.1554365

>>1554107
From lifting the thing up in the first place.