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Experimental analysis of friction coefficients on skateboard surfaces using different emery grits.
Skateboarding is a sport ofan increased rate of injuries. One of the main reasons of injuries is the low friction coefficient displayed by foot against the surface of the skateboard. The surface of the skateboard is coated by emery paper of certain grit size to roughen the surface and increase friction coefficient. The aim of the present work is to select the grit size of the emery paperwhich displays higher friction coefficient.The effect of surface roughness of the skateboard on the frictioncoefficient displayed by bare foot and two shoes is discussed. Experiments were carried out by the sliding of the bare foot and foot wearing shoes against emery papers of different grit sizes. The friction coefficient was investigated. Based on the experimental observations, it was found that,at dry sliding of bare foot and foot wearing shoes, the reference tested emery paper displayed lower friction values than the majority of the tested emery papers. The highest friction values were displayed by 100 grit number emery paper. Shoe 1 displayed relatively lower friction values than bare foot. Shoe 2 displayed lower friction values than that displayed by shoe 1. At water wetted sliding, friction coefficient displayed by bare foot and foot wearing shoes presented lower values than that observed at dry sliding. The majority of the tested emery papers gave higher friction coefficient values than the reference one. Based on that observation, skateboarding could be dangerous using the reference emery paper and emery paper of 100 grit number can be recommended to provide the highest values of friction coefficient and the lowest slip.
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AlOtaiby et al. (2014) studied this question.
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