Why didn’t Robert Lewandowski score a penalty kick against Mexico? How to shoot to get the so-called. Croissant effect? What factors should our players consider before the match against Saudi Arabia? scholars who Gdansk University of Technology presented their analyses.
Most fans have been wondering since Tuesday how the ball Robert Lewandowski scored during the penalty kick wasn’t in the net and therefore didn’t get us close to going out of the group at the FIFA World Cup Qatar. Now, scientists from Gdańsk, who have studied the physical phenomena that occur in sports competitions, also carried out the analysis. What conclusions can be drawn from their observations?
– The “left” modified the way of moving and did not, as usual, change the pace in the previous period. Previously, he always slowed down immediately before kicking the ball, and this time he ran towards it at a more or less uniform speed – says the professor. Aleksandra Miliucek-Green from the Faculty of Technical Physics and Applied Mathematics. – therefore, his movement before kicking was less springy, and his foot moved along a flatter trajectory.
World Cup 2022: Poland – Mexico 0: 0. Robert Lewandowski missed a penalty!
“It flew so flat and so slow.”
It is difficult to say whether Robert Lewandowski was thinking about the principles of conservation of momentum and energy at the time of shooting, but the change in the technique of the shot may have affected the final result.
“Since every impact, in this particular case of the foot on the ball, is governed by the conservation of momentum and energy, the speed of the foot before the ball is kicked and the angle at which the shoe directly hits the ball translates to the angle and speed at which the ball will travel to the ball.” Beata Boshenten from the Faculty of Technical Physics and Applied Mathematics Gdansk University of Technology. “It flew very flat and slow this time. Perhaps our captain wanted to confuse the opponent and change the style of shooting, but sometimes it’s better not to adjust something that has worked so well so far – he adds.
Stadium conditions make a difference
On Saturday, our national team will have another important match at the World Cup. This time, in an air-conditioned stadium, we will face Saudi Arabia, who stunned the world with a victorious match against Argentina. What should players think about?
– First, temperature changes affect air density. The lower the temperature, the higher the density. Beata Boshenten. Just changing the temperature from 25 to 15 degrees Celsius increases the density of air by more than 3 percent.
This, in turn, will translate into an increase in the aerodynamic drag on the ball.
– The ball will be more “braked” in flight and will fly a little shorter and lower on a cool field, that is, the one where the Poles will play on Saturday. These changes during passes and shots, especially from a greater distance, can reach several tens of centimeters, which could mean, for example, hitting the “window” or the stands – explains the professor. Poshentin.
Of course, conditions in Qatar also matter. We are talking about both high temperatures and air humidity.
Humid air is less dense than dry air. Poshentin. – In Qatar, the humidity is very high, even in the range of 50-60%, which may translate to higher humidity in the turf, and therefore less friction of the ball and shoes on the ground. On the one hand, we know that the field is sprayed before the game, so the humidity of the air itself may not matter much. On the contrary, a high ambient temperature can cause rapid evaporation of water and a completely opposite effect – the grass will dry out quickly, and, accordingly, the frictional force against the lawn will increase. Colloquially, in such circumstances, the pedestal will get “sharp”.
Bet with us on the results of the matches. Tipter Trojmiasto.pl program for the Qatar 2022 World Cup
To score like Roberto Carlos, there are several factors to consider
However, if our attackers want to show off a croissant-shaped shot, they need to approach the subject in a more scientific way. It is during such curved strikes, the researchers explain, that the so-called Magnus effect allows the ball to eventually deflect into the goal.
– Remember Roberto Carlos’ brilliant shot in the 1997 Brazil-France match. He managed to replay it thanks to the fact that the curvature of the flight path depends on the air pressure around the ball and the speed of the ball’s movement, – explains prof. Mielewczyk-Gryn. – Shooting the ball the same way in a “warm” stadium will spin less than in an air-conditioned stadium. Admittedly, these changes are on the level of a few percentage points, but in extreme cases they can “make a difference”.
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