Coefficient of Friction of Watermelon

The static and dynamic coefficients of friction for two watermelon cultivars against six different surfaces were measured at three sliding speeds and three normal forces. The sliding speed, measurement (harvest) date, and type of abrasive surface had a significant effect on both coefficients, except sliding speed did not affect the dynamic coefficient of friction. Normal force did not affect either coefficient and the two watermelon cultivars had similar coefficients in most cases. The rubber belting surface produced the highest and smooth masonite the lowest friction coefficients. Coefficients of friction computed by two methods were similar in 75% of the cases.