The thickness, width, length and weight of cereal seeds (wheat, rye, barley, oats and triticale) and their external friction angles on three types of surfaces – steel, methyl polyacrylate and rubber – were determined. The experiment was performed with the use of a new device that measures the angle of external friction and the time taken by seeds to travel a given distance, which supports the determination of the coefficient of kinetic friction. The measured parameters were used to calculate arithmetic and geometric mean diameter, aspect ratio, sphericity index, specific weight, volume and density of seeds. The correlations between the analyzed parameters were evaluated by analysis of variance, correlation analysis and linear regression analysis. The dimensions, weight and the calculated indicators of the examined seeds did not affect their angles of friction or the coefficients of static and kinetic friction. The studied parameters were significantly influenced by the type of friction surface, and significantly lower average values were reported for the steel surface. An inversely proportional correlation between static and kinetic friction coefficients was also observed for the steel surface.
Key words: Physical attributes, coefficient of external friction, correlation.
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