Is there proof gravity can not be a energy source?

[fletcher]

Brian33 - an apple resting on a table IS experiencing a constant acceleration due to gravity of 9.80665 N's [assumes at earths surface].

It is just unable to move vertically, but the acceleration 'g' is there always - since it can't move vertically it doesn't have any Ke or ability to do Work - it does have Pe but that is unrealised until the table is moved out of the way etc & it can move downward.

N.B.1. these fundamental equations are based on Newton's Laws & Newton mechanics & hold true for 100% of the time we discuss things like masses on wheels etc.

N.B.2. note that when discussing Gravity Force we have to introduce MASS into the equation & have it multiplied by acceleration to get Newton's of Force.

e.g. to find the number of N's that a 10 kg mass has we use ... F = m x a where a = 'g'

therefore m = F/a  => 10 kg = F / 9.80665 = 98.0665 N's.

[camelherder49]

As an analogy, there is a way to return the gravitational fuel (water)
in the instance of Niagara Falls, back to its' original starting position
using far less input energy than is being created, with a pseudo "sun" process handling the water cycle circulation.

[fletcher]

This has already been explained a numner of times and therefore it need not be repeated over and over again in bulkier and bulkier posts.

One thing, however, shouldn't happen. No further confusion should be instilled in his already confused enough wqy of understanding elementary physics, .. snip ..

We agree on one thing omnibust.

[exnihiloest]

That question was already answered. Gravity is not an energy source by definition. Gravity is force. Force is not an energy source.

4 statements above, 2 false assertions due to ignorance or stupidity.

There is energy in the gravity field. Gravity is not force.
When two bodies attract one each other, and accelerate, energy is taken from their gravitational field, whose energy density decreases while the field redistributes in space, changing of topology due to the bodies movement.
Gravity field energy density is: D = g²/(8*pi*G).
It is the same as the energy density of an electric field (1/2*epsilon0 * E²) or magnetic field (1/(2*mu0) * B²). It is a general law when fields are the source of 1/r² forces.

[ResinRat2]

The topic is - is there proof gravity can not be a energy source.

4 statements above, 2 false assertions due to ignorance or stupidity.

There is energy in the gravity field. Gravity is not force.
When two bodies attract one each other, and accelerate, energy is taken from their gravitational field, whose energy density decreases while the field redistributes in space, changing of topology due to the bodies movement.
Gravity field energy density is: D = g²/(8*pi*G).
It is the same as the energy density of an electric field (1/2*epsilon0 * E²) or magnetic field (1/(2*mu0) * B²). It is a general law when fields are the source of 1/r² forces.

So the question is answered.



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