The friction coefficient was measured for about 80 runs under different conditions. A table of the conditions and results is shown in Appendix-5. The major conditions are:
The sliding situation under this conditions was recorded and edited into Movie 2 and the results are described in this section. Other results are discussed in the section of the comparison experiment.
![]() Movie 2. The sliding of disk on the flour layer. This movie was edited to contain the view of sliding disk from above, the view from end of the sliding , and the track left in the powder layer. |