American football is played on a rectangular field, with a length of 120 yards (110 meters) wide and 53 1 / 3 yards (49 meters). Outermost lines along the field is called the sideline (line side), while the outermost line at both ends of the field called the end line (finish line). On both the left and right field are the goal line (goal line). The distance between the two sides of the goal line is 100 yards. Fields scored a place called the end zone (end zone) and 10 yards in length calculated from the goal line until the finish line.
Along the field lines cross is made every 5 yards, called the yard (yard line). Every 10 yards, the distance marked yard line that starts from both sides of the goal line and ended up in the middle of the field (goal line), -10, -20, -30, -40, 50, 40 -, 30 -, 20 -, 10 - (the goal line). The lines that run across the football field similar to the lines on the rugby league field. Short lines at the edge of the field is called hash marks (a hash) that mark each length of yards from the field. Each initial movement of the ball starting with a hash mark the ball's position at or between two hash marks.The position of goalkeeper is placed outside the end zone
At the end of each end zone (end zone) there goalposts (called the goal posts or uprights). American football goalpost shaped like a tuning fork with a pillar height of 10 feet (3 meters). Goals must be signed between the two goalposts. Both goal posts separated by a distance of 18 feet 6 inches (5.6 meters) and mounted on an iron cross (cross bar) to form the mouth of the goal as the letter "U". In inter-school match, the distance between two goal posts are 24 feet (7.3 meters) so that the ball more easily entered. High goalposts until the very end to reach 30 feet (9 meters) from the top surface of the field. On the field for the game of professional, college and high school, the goal stanchion placed outside the playing field. Pillar also made curved outwards the field to reduce the risk of injury from hitting the pole.
Each team took to the field with 11 players. The team could replace some or all of the players when the time is still possible, or the movement of the ball during the pause. Each team has 46 players in one game and wear can be exchanged at any time throughout the game. Almost all the players the chance to down play and no one is unemployed.[Edit] Old game
Standard game consists of 4 rounds (called quarters), while each round consists of 15 minutes. Called the halftime break is given after the 2nd round is completed. 12-minute one-act system used in inter-school match. Hours match ball is stopped if there is a movement which, according to game rules require that the match was stopped, the result when the game becomes much longer. NFL game often takes more than 3 hours since the game clock to be stopped when there is no ball movement.
If both teams still scored the series until the 4th round is over, the NFL extended the match with an additional round for 15 minutes (overtime). In the game system used sudden death overtime, first team to score declared the winner, even though the opposing team no chance to get the ball. Match declared a regular game series in the NFL when both teams failed to score in extra rounds.
In an NFL playoff round match, when both teams continued to score the series, the game continued with additional rounds until one team wins.
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