When starch was used as the powder material, the slide contains three
phase observed in the runs in which flour was used.
mB range from 0.072 to
0.078; this was smaller than
mB for flour (from 0.11 to 0.15).
When silica sand was used, the slide condition and deceleration
could not be observed clearly because the disk
raised a cloud of powder (Movie 6). m* was 0.61-0.73; it was larger
than the friction coefficient without the powder layer. |
![](icons/video.gif)
Movie 5. Sliding on the starch layer.![](images/fig016.gif)
Fig. 16. Friction coefficient versus basal pressure of the disk.
![](icons/lbsq.gif) |
:m B for dogtooth violet starch layer |
![](icons/dbsq.gif) |
:m B for
flour layer |
![](icons/dbsqline.gif) |
:m B for
flour layer in another month |
![](icons/orsi.gif) |
:without flour layer |
![](icons/video.gif)
Movie 6. Sliding on the silica
sand layer.
|