Can the mass of an object be changed by adding opposing magnetic fields? Apparently it does. Or is this voodoo physics. If not what is really happening in this case?
https://www.youtube.com/watch?v=8N2TS3VReTA Boyd Bushman Changed the mass of a black box object, rock. He took two black box rocks. One rock he added two magnets connected in oppositon S-N-N-S bolted together. And the other rock had no magnets. He then drop them both at same time from a 40 story building and the rock with magnetic fields in opposition canceled out the mass gravity to a small percent and fell more slowly then the rock with no magnetism. Real effect on not? Are there any field equations that tie gravity directly or indirectly to magnetism?
 A: It's obviously wrong: mass don't change. Now the effects of mass might be tilted by some other forces.
Moreover, the speed of free fall is not related to mass as well (at 1st order).
A: 
Can the mass of an object be changed by adding opposing magnetic fields?

Yes. When you push two opposing magnets together you add energy. So the mass increases. It's the same when you compress a spring.  

Apparently it does. Or is this voodoo physics?

That's interesting. I've never seen that before. I hesitate to say it's voodoo physics because a magnet falls slowly through a copper pipe.  

Boyd Bushman Changed the mass of a black box object, rock. He took two black box rocks. One rock he added two magnets connected in opposition S-N-N-S bolted together. And the other rock had no magnets. He then drop them both at same time from a 40 story building and the rock with magnetic fields in opposition cancelled out the mass gravity to a small percent and fell more slowly then the rock with no magnetism. Real effect on not? 

I don't know. Sorry. I'd like to see somebody repeat this.   

Are there any field equations that tie gravity directly or indirectly to magnetism?

No, there aren't any. But note that an electron has an electromagnetic field. Not an electric field or a magnetic field, an electromagnetic field. So does a proton, or a copper ion. And when we arrange electrons and copper ions as the current in the wire, the opposite electromagnetic fields don't quite cancel, and we call the difference, the "residual trace field", a magnetic field. Then when we stop the electrons, the fields still don't quite cancel. There's still a residual trace field. But we don't call it a magnetic field any more. 
A: A simple magnet will fall slightly more slowly than a non-magnet because of extremely small eddy currents created in empty space (space has some level of permeability). However, if it is not shielded from the Earth's magnetic field, it should fall slightly faster because it is one large magnet (the earth) attracting the small magnet. Both effects are extremely small and I don't know which is greater.
