When any part of the ball or any part of the ball carrier touches the out of bounds line, the ball is out of play.
In soccer, the entire ball must cross the goal line for a goal to be awarded or for the ball to be considered out of play.
The lines are part of the soccer field when the ball is in play. We know that the Laws of the Game require that a ball cross wholly over the touch line to be in touch (out of play), or wholly over the goal line within the goal to be a goal (fouls or other infractions of the Laws of the Game aside).
Also known as the end line, the goal line is the line that runs the width of the field. It runs across the front of the goal and when the ball passes the end line within the goal posts, a goal is scored. If the ball passes the end line outside of the goal posts, the ball is out of bounds. Depending on who touched it last, a corner kick or goal kick will restart play.
In association football, the ball must completely pass over the line: on is in.In American football and rugby football, any contact with the line makes the ball or player out of play: on is out.
A goal kick does not have to cross the halfway line. However, it must completely exit the Penalty Area while in the field of play in order for the ball to be back in play.
The team that has the ball has to cross the touchdown plain (white line) and still have possession.
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In volleyball, it is not permissible to cross the center line during play.
CROSSING CENTER LINE: During play, any part of a player's body may touch the center line, and, in addition, only his/her foot or feet may contact the playing area on the opposite side of the center line providing that some part of each encroaching foot remains on or above the center line at the time of such contact. Any part of a player's body may be in the air below the net and beyond the center line if he does not interfere with the opponent's play by touching the ball or an opponent. A player may reach under the net to retrieve a ball that is in play by their team. The spiker's motion may legally carry his/her hand over the net on the follow-through provided that contact is made with the ball when at least a portion of the ball is directly above the net or it is clearly on his side of the net.
A goal in soccer is scored when a player kicks the ball into the net. Here the entire ball must cross the goal line, , even if the goalkeeper both legs cross the line , the goal will not be given until the ball also crosses the line.
When the ball carrier is tackled and does not pass ball to teammate or the ball is out of bounds, the play is called a scrum, and the yard line where the last play was downed is called the line of scrimmage. -----In American football, draw a line from sideline to sideline where the ball is put into play on each down and that is the line of scrimmage.
Yes, in tennis, if the ball lands on the line, it is considered in play and not out.