The effect creates a swirling shot in football

Swirling is a very popular finishing technique in football, especially when it comes to penalties.

The aerodynamic force (the force exerted by the air on a moving object) makes the balloon follow a curved trajectory. Instead of hitting the center of the ball, the player will deflect to the side so that the ball rotates in the air.

Instead of hitting the center of the ball, the player will deflect to the side so that the ball rotates in the air.

Swirling shadows create turbulent air currents around. Initially, the ball moved almost in a straight line due to very little resistance. But then, the air becomes more chaotic, increasing resistance and slowing the ball down. Then the vortex creates a speed difference between the air currents on either side of the ball, creating an effect called Magnus .

Specifically, on one side, the air moves in the same direction as the ball's rotation so the gas molecules move faster. On the opposite side, the ball swirls in the opposite direction with the direction of air movement, causing a drag on the gas molecules to slow down.

According to Bernouilli's principle, when the velocity of the air flow increases, the air pressure will decrease and vice versa. The static pressure difference creates an impact force on the ball, causing the ball to be drawn towards the lower pressure, creating the curvature of the ball.