Jenna Borovinsky
The Physics of Scoring a Soccer Goal Off Of a Corner Kick
Scoring a goal off of a corner kick is incredibly rare. It is known as the “Olympic goal.” Out of my 15 years of playing soccer I have witnessed maybe one goal being scored off of a corner kick. Even trying to practice scoring a goal off of a corner kick is incredibly difficult without both a goalie and field players present, as a goalie and field players are extra barriers preventing this goal from occurring. In order to score this goal you have to “bend,” or curve the ball into the goal, which you can’t even see when kicking the ball at the corner kick position.
The first thing one has to take in account when shooting this corner kick is the wind, or force of air resistance. Thus, when kicking the ball one has to do so a few yards away from the goal into the 18-yard box as the force of air resistance will push it towards the goal. One also needs to have swerve on the ball. Bernoulli's principle is the principle that states as air velocity increases, air pressure decreases. Thus, there is reduced pressure on the side of the ball that air velocity is moving towards; this causes the ball to curve towards that direction. Furthermore, the swerve which generates the ball bending is known as the Magnus effect. This is why there is controversy when it comes to the creation of soccer balls with less panels. A soccer ball with more panels, or the stereotypical soccer ball, theoretically is more suited for the Magnus effect because it has more roughness. The applied force from kicking the soccer ball causes it to accelerate at a fast speed, air resistance causes the ball to slow down, and the force of gravity causes the ball to fall down. It is the Magnus effect that causes the ball to not move in a straight path, but rather curve into the goal. Thus, when one kicks the ball in the wrong position it will either not curve inwards enough and move in too much of a straight direction, or curve too much and miss the goal completely. The direction of the foot and location in which one kicks the ball is incredibly important in optimizing the Magnus effect. Essentially, if you want to curve the ball to the left you should kick the ball from the right side of the ball. And, if you want to curve the ball to the right you should kick the ball from the left side of the ball. This is because the Magnus force moves in the direction you kick the ball towards, and lifts the ball upwards from staying on the ground. Drag force moves in the opposite direction of the ball direction. And the spin direction is perpendicular to the ball direction. Further, the needs to have a great enough applied force to reach the goal dimensions of the width being 7.32 meters (8 yd) apart, and the height of the goal being 2.44 meters (8 ft). Kinetic energy also plays a role the velocity and mass of one’s leg plays a role in the ball kicked. Thus, there are a lot of factors that need to go right in order to even have a shot on goal from the corner kick spot which is around 37.5 m away from the center of the goal.
The Magnus Effect
http://ffden-2.phys.uaf.edu/webproj/211_fall_2016/Juan_Acevedo/Juan_Acevedo/Magnus%20Effect.html
https://www.wired.com/story/the-physics-of-the-one-goal-you-wont-see-at-the-world-cup/
http://ffden-2.phys.uaf.edu/211_fall2013.web.dir/josh_kunz/Physics.html
https://www.youtube.com/watch?v=n0TDcTFK8JI
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