The discussion centers on the physics of spinning balls in sports, particularly table tennis and baseball. Participants highlight that topspin causes the ball to drop faster due to the Bernoulli principle, where faster airflow beneath the ball reduces pressure, leading to a downward trajectory. Friction plays a crucial role, as it affects the ball's spin and the resulting air turbulence, which can alter the ball's path. The conversation draws parallels between the behavior of table tennis balls and curveballs in baseball, emphasizing the importance of understanding these dynamics for improved performance.
PREREQUISITESSports scientists, table tennis players, baseball pitchers, and anyone interested in the physics of ball dynamics and performance optimization.
Meir Achuz said:It is the same as a curveball.
Friction is important. That is why pitchers try to scruff up the ball.
The air flow is slowed down on the top side.
The faster flow on the bottom side reduces that pressure by Bernie's theorem.
Also turbulence at the top increases the pressure there.
Since the ball is rotating in the direction of motion, the friction force on the top surface is much larger than on the bottom surface. But even without that effect, the friction causes the air to rotate around the ball.pixel01 said:I agree with you that friction is important. But the force caused by friction isn't up or down is it?.