So I've done a practical investigation.
Pretty much I used a elastic band to launch a puck on a horizontal floor. I have measured the extension and force for the elastic band, and the extension and stopping distance for the puck on two different surfaces.
How do I calculate the coefficient of...
Hey, could the magnet strength be a problem? I’m using ferrite magnets which are pretty weak
Could rare Earth magnets do the trick?
The connection seems to be fine with the coil / brushes / commutator and battery.