(Okay so this question might sound trivial to all of you smart physicists, but stay with me and provide your opinion)
I have been seeing a lot of videos recently on the internet about how you can make a generator using a DC fan and by glueing neodymium magnets all facing the same direction on the blades of the fan, . Whenever you place a large magnet next to it, the repelling force of the magnets would cause the fan to move in a constant motion and spin. The fan in motion would spin a motor and could generate small amounts of current.
A lot of physicists on the internet said that this is impossible and the videos are fake. I was curious and wanted to try it so I replicated the experiment and had no success. I don't know much about the physics of magnets, but wouldn't this "theoretically" work? I mean, you couldn't generate free energy from it according to the law of conservation of energy and mass, but is it possible to use magnets to cause a motor to spin? Why is it impossible?
If this method isn't possible is there perhaps another way that this could work?