Materials

Static friction coefficient

Dynamic friction coefficient

Galvanized steel
Iron sheet
Plywood
Rubber

0.35±0.02
0.48±0.01
0.51±0.04
0.67±0.03

0.29±0.02
0.41±0.02
0.43±0.02
0.56±0.03
C. spinosa

Materials

Static friction coefficient

Dynamic friction coefficient

Galvanized steel
Iron sheet
Plywood
Rubber

0.36±0.02
0.42±0.02
0.56±0.03
0.65±0.03

0.31±0.02
0.36±0.03
0.49±0.02
0.55±0.03
C. ovata
Table 7: Relationships between friction coefficients and moisture content of C.spinosa and C.ovata seeds for various material surfaces.