Hi. First I want to say that I'm not a physicist. I'm just a layman. Well, I'm very disturbed with an experiment that I had imagined and I wish someone would help me understand if my reasoning would be correct... First of all, I wish to know if this experiment could work in a laboratory: http://img202.imageshack.us/img202/2290/experiment.gif [Broken] (I put this drawn on ImageShack to facilitate viewing of the idea). This is NOT my "final" experiment yet. First I need to know if this one should work. Explaining this first experiment: It would be a large electro-magnet, capable of generating a magnetic field strong enough to magnetically attract a metal disc located five meters away. . The metal disc was placed on "support rails", but would be free to move forward and backward. The disk would be initially located 1 centimeter away from a wall of glass. When the electro-magnet was activated, would attract the metal disk, which would collide with the glass wall, which would prevent the disk's advance forward. Thus, while the electro-magnet was turned on, the metal disc would be stuck on the glass wall. My first question: Is this experiment possible? Would it work this way? If you consider this experiment is possible, I will explain my whole idea, that is an "extrapolation" of this experiment.