Laboratory four momentum pre-thoughts
Laboratory four has been reworked many times. The problems have been many. Fundamentally, linear momentum is not conserved for marbles. Secondly, timing measurements are problematic and plagued by reaction time errors coupling up with very short time intervals. Originally laboratory four attempted to show conservation of momentum for marbles using one into a line of five on a ruler. When this did not go as well as planned, track friction was blamed. WD-40 was used to reduce track friction, but this caused the scotch tape that held the ruler tracks down to release. The WD-40 wound up on everything including laboratory sheets. Results run with lubricated tracks still showed a strong loss of momentum. At this point I realize that rotational momentum was also in play and was definitely not a conservable quantity. The inbound marble stops spinning, while the outbound marble has to spin up. Long tracks were also tried , with no useful improvement in the results. The long...