UPDATE : 2020.6.15 Mon 08:55
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With Bernoulli Principle You can see a curve ball
You had the experience that you were charmed in the ball which is alive in the cartoon. This is not just the fact in cartoon. The demon’s pitchers who are famous for catching hitters such as Sun and Park are good at controlling the curve ball. Occasionally, it is awesome when they pitch the sinkball. So, how does it happen like the sinkball?

Unlike an unpredictable person, we can see control and prediction in a ball, because of its following a physical principle. It is the Bernoulli’s theorem which controls the curve ball, when the speed of fluids increases, the pressure must be decreased. In this principle of the sink ball, when the pitcher throws a ball, the direction is the same in order to rotate with the direction, threw the curve ball. Lower part of the ball becomes quick as the same direction where the air passes. So, the pressure of lower part of the ball decreases and the fluid tends to flow from the high place to the low-place, the ball drops to the lower part. Especially in the Bernoulli’s theorem, when the ball is arriving near the plunger plate, it can show overwhelming power.

At the moment when it leaves the pitcher’s hand, it is straight because the ball’s straight speed is faster than the rotation speed. The speed becomes slowly near the plate and relatively, as the rotation speed comes to be strong, hitters feel as if the ball is alive. Then, how can pitchers rotate balls? The ball is made by various leather, pitchers tend to rotate as grip balls using nails. Moreover, the piece of thread makes the ball rotate, so the rotation speed is increasing. It makes the curve ball. Besides, there are the soccer ball and the tennis ball, round pattern golf ball. etc. ordinarily, we can see them using the Bernoulli’s theorem. Then, the competition is not occurred only in the stadium. The science is repeating an evolution gradually in order to win the even victory.

Ock Jin-Young  merrong86@changwon.ac.kr

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