{"id":143426,"date":"2020-12-29T14:11:49","date_gmt":"2020-12-29T11:11:49","guid":{"rendered":"https:\/\/en.buradabiliyorum.com\/the-wall-can-make-it-harder-to-save-free-kicks-new-research\/"},"modified":"2020-12-29T14:11:49","modified_gmt":"2020-12-29T11:11:49","slug":"the-wall-can-make-it-harder-to-save-free-kicks-new-research","status":"publish","type":"post","link":"https:\/\/buradabiliyorum.com\/en\/the-wall-can-make-it-harder-to-save-free-kicks-new-research\/","title":{"rendered":"#’The wall’ can make it harder to save free kicks \u2013 new research"},"content":{"rendered":"

“#’The wall’ can make it harder to save free kicks \u2013 new research<\/strong>”<\/p>\n

\n In football, free kicks occur when the referee believes a rule has been broken. If central enough and within 30 metres from the goal, the attacking team typically attempts a direct shot on goal. However, the goalkeeper routinely places a “wall” of defensive players in between the ball and the goal to complicate the kicker’s task of shooting on target<\/a>.<\/p>\n

While this strategy is often effective, the wall frequently obstructs the goalkeeper’s initial view of the moving ball. Although the negative effects<\/a> of this obstruction have been assumed by experts<\/a>, they had not been scientifically quantified until recently.<\/p>\n

To do so, our team created a goalkeeping simulator using virtual reality. Both eyes see the world from slightly different perspectives, which gives us our 3-D vision. Virtual reality creates the sense of seeing a 3-D world by presenting distinct images to both eyes using a head-mounted display. <\/p>\n

The exact images of the virtual scene presented to both eyes depend on the continuously measured position and direction of the person’s head, which are imported into a software model of the virtual world and the objects within it, which we can also see on a separate screen. This model includes virtual hands, the positions of which are updated continuously based on the measured position of additional sensors attached to the actual hands. <\/p>\n

A virtual football is moved along a trajectory that accounts for gravity and the aerodynamic effects of air friction and spin. When making contact with other objects (hands, goal, ground), the ball rebounds. This simulator can also be used to show the goalkeeper a realistically moving avatar of the kicker based on recordings of actual free kicks (as our team did previously for cricket<\/a>).<\/p>\n

Key effects of the wall<\/b><\/p>\n

In our study<\/a> it was clear that obstructing the initial view of the ball affects the goalkeeper. When the ball comes into view later, moving initially behind the wall, goalkeepers start moving later, leaving less time for them to get in between ball and goal. <\/p>\n


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