Per Oni, thanks for you help. Your method makes sense but is not conclusive with my data. I think it may be easier if you see my data than me describing what I've found!
N V
1 0.568
2 0.279
3 0.269
4 0.264
5 0.318
6 0.370
N is the number of magnets, V is the average velocity...
Right. I know if you drop a strong magnet down a copper tube (or conductive but non magnetic tube) it falls slowly as it 'sees' a changing magnetic field and thus induces a current in the tube and this induced current causes its own magnetic field to be induced and acts a resistive force to the...