A paradox of the table-tennis ball? Some friends my argue about the ball spin and curve. At first I thought it can be explained by bernoulli effect. But I can see a paradox here. When the ball is top spin, it will dive faster, while the upper part is moving faster than the lower part (see figure), so if following the bernoulli, the top spin ball must float more, not dive as it does. I hope someone will explain to me. Thank you.