Linked Questions

0
votes
2answers
306 views

Doesn’t gravity violate the first law of thermodynamics? [duplicate]

So gravity is a force, and when it pulls on an object the object gains kinetic energy. However, doesn’t this mean that energy is being “created”, since the object gains kinetic energy? Why doesn’t ...
-1
votes
1answer
358 views

conservation of energy in orbital motion [duplicate]

Case I: Here, a trajectory is placed stationary in the path of a planet's orbit. Now this trajectory has no mechanical energy to speak of. Now as the planet approaches the object the object comes ...
1
vote
1answer
116 views

Where does gravity get the energy to pull the ball? [duplicate]

I have read many answers here about gravitational potential energy. Suppose that I am holding a ball 5 meters from the ground and I release it and it falls to the ground. Now i get that it falls ...
2
votes
1answer
104 views

The source of work by gravity force [duplicate]

I learn that any work needs a source of energy, the work of gravity force (like keeping the Moon in the orbit by the Earth gravity force) comes from where? Can we find any mass reduction (transform ...
2
votes
0answers
53 views

Does gravity follow law of conservation of energy? [duplicate]

Law of conservation of energy states that energy cant be created nor destroyed.I dont understand how it is applicable for a object moving under influence of gravity.If some force has been applied on ...
0
votes
0answers
43 views

Where is the force of gravity fueled from? [duplicate]

So one thing I don't understand, gravity moves 2 masses closer together. But to move something/to exert force on something you need to expend energy. But gravity has been moving stuff and keeping it ...
81
votes
4answers
13k views

Where does the extra kinetic energy come from in a gravitational slingshot?

I read in this answer in this site that the KE a free-falling ball acquires is not originated by the attracting body but that energy was actually stored in the ball when it had been lifted to the ...
14
votes
8answers
36k views

Is gravity just electromagnetic attraction?

Recently, I was pondering over the thought that is most of the elementary particles have intrinsic magnetism, then can gravity be just a weaker form of electromagnetic attraction? But decided the ...
12
votes
2answers
604 views

Why should the modes of the linearized metric perturbation be “wavefunctions” of gravitons (in the Randall-Sundrum model)?

In "An Alternative to Compactification" by Randall and Sundrum, they discuss the localization of "graviton modes" around the Planck brane in the Randall-Sundrum model where we have ...
4
votes
6answers
4k views

From where does gravity get its energy to do work upon an object?

For an object or force to do work, it needs energy. But, from where does the gravitational force get the energy to do work upon, say, a falling object? The gravitational force is doing work upon the ...
0
votes
1answer
99 views

Is it possible that gravitation is not reconcilable with quantum mechanics? [duplicate]

And if so would there be any way of proving this?
1
vote
0answers
72 views

Where does gravity get's its energy from? [duplicate]

So I have read this post and I have another question about it. The first answer says that if we lift an object up that is the energy we "give" to gravity and then gravity uses that energy to pull the ...