Topspin
![](/Images/godic/202502/17/Topspin1910.png")
![Other than trajectory in air, top spin affects the bounce of the ball as shown.](/Images/godic/202502/17/Top_spin_1.svg1910.png")
![The Magnus effect, demonstrated on a ball. v represents the wind velocity, the arrow F the resulting force towards the side of lower pressure.](/Images/godic/202502/17/Magnus_effect.svg1910.png")
![](/Images/godic/202502/17/Tennis_Racket_and_Balls1910.jpg")
In ball sports, topspin is a property of a ball that rotates forwards as it is moving. Topspin on a ball propelled through the air imparts a downward force that causes the ball to drop, due to its interaction with the air (see Magnus effect). Topspin is the opposite of backspin.