Some previous studies have reported the consistency of the model calculations of the impact force, angle of reflection,
coefficient of restitution, and the ball speed and angular velocity after impact. The others have reported the theoretical analyses
of the effect of friction for impact if the ball and the flat surface have friction, or not. But only few data from the previous
research have reported the experimental measurement of the impact of the soccer ball, which is pressurized spherical elastic
shell, against the flat surface which has friction. This study is primarily intended to find out the property of the characteristics of
the friction force which is formed by the collision of the soccer ball against the materials used for the goalkeeper gloves,
changing the impact speed from 10 to 30 m/s. The soccer balls shot out by the 3 rotors machine keep the angular velocity 0 and
come into collision on the angle with the rectangular-shaped latex formed material used for the goalkeeper gloves on the force
plate. The impact force is measured vertically and horizontally from the force plate. Getting the averaged impact force curves,
we discussed about the feature of the friction force between the soccer ball and the latex formed material. In addition, we
measured the surface texture of the latex formed material by using the laser displacement meter, and discussed the relationship
between the friction force and the surface texture.
Some previous studies have reported the consistency of the model calculations of the impact force, angle of reflection,
coefficient of restitution, and the ball speed and angular velocity after impact. The others have reported the theoretical analyses
of the effect of friction for impact if the ball and the flat surface have friction, or not. But only few data from the previous
research have reported the experimental measurement of the impact of the soccer ball, which is pressurized spherical elastic
shell, against the flat surface which has friction. This study is primarily intended to find out the property of the characteristics of
the friction force which is formed by the collision of the soccer ball against the materials used for the goalkeeper gloves,
changing the impact speed from 10 to 30 m/s. The soccer balls shot out by the 3 rotors machine keep the angular velocity 0 and
come into collision on the angle with the rectangular-shaped latex formed material used for the goalkeeper gloves on the force
plate. The impact force is measured vertically and horizontally from the force plate. Getting the averaged impact force curves,
we discussed about the feature of the friction force between the soccer ball and the latex formed material. In addition, we
measured the surface texture of the latex formed material by using the laser displacement meter, and discussed the relationship
between the friction force and the surface texture.
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