ソフトテニスボールに見られる「ふく」現象について

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書誌事項

タイトル別名
  • “Fuku” phenomenon seen in soft tennis ball
  • ソフトテニスボール ニ ミラレル 「 フク 」 ゲンショウ ニ ツイテ

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When a ball moves forward with a top spin (forward rotation), a downward force is applied to the ball and it falls faster than the case without the rotation. When it moves forward with a back spin (reverse or slice rotation), an upward force is applied the ball and it stays in the air longer than in the case with no rotation. In soft tennis play, it has been empirically confirmed that a peculiar flight behavior such as a motion of the ball is stretching despite the drive rotation or suddenly dropping despite the slice rotation. These motions commonly known as "Fuku” phenomenon. The purpose of this study is to analyze the cause of this “Fuku” phenomenon from the viewpoint of the Magnus effect. By using the super slow mode of Video camera, we find that the ball is flying with a rotating ellipsoid-like shape which has a larger aspect ratio in the shape than the usual motion. In addition, the axis of rotation is tilted from the horizontal by about 34~42°. We calculate the magnitude of the force due to the Magnus effect on the soft tennis ball. Then we find that the magnitude of the tilt is likely to be a factor which reduces the force due to the Magnus effect. From these results, it is possible to intentionally generate the "Fuku" phenomenon by shaking the racket or applying the ball and racket.

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