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。

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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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Friction also affects the amount of spin on the ball.

BBC: SPORT | Tennis | Rules and Equipment | On the rebound

When a spinning ball hits a low friction surface such as grass, it will continue to spin.

BBC: SPORT | Tennis | Rules and Equipment | On the rebound