If you spin a top, that we know that the top will not last very long because of friction.
如果你转一个陀螺，你会发现因为摩擦力，陀螺不会永远旋转。
This study showed that an increase in the coefficient of friction between the ball and the foot caused the ball to acquire more spin.
这项研究表明，脚和球之间的摩擦系数的增加导致了球获得更多的角动能。
This study showed that an increase in the coefficient of friction between the ball and the foot caused the ball to acquire more spin.
这项研究表明，脚和球之间的摩擦系数的增加导致了球获得更多的角动能。
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