Table S2.

Friction coefficients for dorsal and ventral surfaces relative to the body and feet

SurfaceMaterialNormal force, NPeak drag, NSliding drag, NCoefficient of friction
Body (static)Body (kinetic)Leg (kinetic)
Ceiling
 LowAcrylic (graphite powder)0.28 (0.01)0.03 (0.00)0.02 (0.00)0.09 (0.00)0.09 (0.01)1.73 (0.08)
 MedAcrylic0.29 (0.02)0.06 (0.02)0.04 (0.00)0.21 (0.01)0.14 (0.01)1.73 (0.05)
 HighSandpaper (40-grit)0.28 (0.02)0.19 (0.02)0.13 (0.01)0.69 (0.04)0.46 (0.04)1.73 (0.09)
Ground
 LowSandpaper (100-grit)0.26 (0.04)0.12 (0.01)0.10 (0.00)0.47 (0.03)0.37 (0.03)0.84 (0.04)
 MedSandpaper (40-grit)0.28 (0.02)0.19 (0.01)0.13 (0.01)0.69 (0.04)0.46 (0.02)1.73 (0.05)
 HighSandpaper (20-grit)0.27 (0.02)0.22 (0.01)0.20 (0.01)0.83 (0.05)0.76 (0.06)2.04 (0.11)
  • n = 50 trials, n = 2 animals; no effect of individual. All values mean ± (1 SD).