381
Physics, Astronomy & Cosmology / Re: where does this energy come from?
« on: 01/01/2017 11:20:37 »
I have a good point, it may reveal something important, but let's stuck on a permanent magnet as it would be more complicated by using current, this problem is itself hard and tricky, I will give it a try :
the potential energy:
suppose we have a rock on the surface of earth, I lift it a meter high, then I did work, I consumed part of my body energy to do this work, but my energy did not disappear, it became potential energy, that means my energy is stored as potential energy, it can return again to the surface without me doing another work , but its returning itself is a work done, as it returns to its original place the resultant work is zero , the tricky thing is what was the start, was it me first lifting it or it was up there and fall down by gravity ? I think the first
work was done by gravity, it was at infinity and came to earth then work done, if I did work by taking it away to infinity then I did work it reaches again its
original first point but we have two works done here the first one by gravity, and the second one by me , I did work to overcome work done by gravity if did not return back or there is not any force acting on it ( as the case by cancelling magnetism)
the net work will be zero , but what is net work consists of ? its positive work done by gravity and negative work done by me, if we suppose gravity cancels ( as magnetism) at that exact point then the first existing of gravity make work done , the first existing of magnetism or magnetizing also make work done
however if I cancel magnetism, the tricky loop will end , and we have work done because of magnetizing, take in consideration that this
work done by magnetizing depends on how many pieces of iron are there at infinity if we have more pieces more work will be done, taking in consideration that a piece of iron at infinity has force approaches zero that means when magnetizing it is impossible to take in consideration pieces of iron at infinity so that energy will be consumed during magnetizing process, so where this energy come from ? this energy will appear wherever there is pieces of iron , but it does not first depend on their existence?
and the idea of more pieces will give more energy, does it have infinite value ?
thanks,
the potential energy:
suppose we have a rock on the surface of earth, I lift it a meter high, then I did work, I consumed part of my body energy to do this work, but my energy did not disappear, it became potential energy, that means my energy is stored as potential energy, it can return again to the surface without me doing another work , but its returning itself is a work done, as it returns to its original place the resultant work is zero , the tricky thing is what was the start, was it me first lifting it or it was up there and fall down by gravity ? I think the first
work was done by gravity, it was at infinity and came to earth then work done, if I did work by taking it away to infinity then I did work it reaches again its
original first point but we have two works done here the first one by gravity, and the second one by me , I did work to overcome work done by gravity if did not return back or there is not any force acting on it ( as the case by cancelling magnetism)
the net work will be zero , but what is net work consists of ? its positive work done by gravity and negative work done by me, if we suppose gravity cancels ( as magnetism) at that exact point then the first existing of gravity make work done , the first existing of magnetism or magnetizing also make work done
however if I cancel magnetism, the tricky loop will end , and we have work done because of magnetizing, take in consideration that this
work done by magnetizing depends on how many pieces of iron are there at infinity if we have more pieces more work will be done, taking in consideration that a piece of iron at infinity has force approaches zero that means when magnetizing it is impossible to take in consideration pieces of iron at infinity so that energy will be consumed during magnetizing process, so where this energy come from ? this energy will appear wherever there is pieces of iron , but it does not first depend on their existence?
and the idea of more pieces will give more energy, does it have infinite value ?
thanks,