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American football
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American football, known in the United States as simply football is a competitive team sport related to, derived from, and somewhat similar to, other forms of football, but differing from most of them in significant ways. (The one other form of football that differs only slightly from American football is Canadian football.)
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Popularity
Football is extremely popular in the US. In recent years it has surpassed even baseball as the nation's most popular spectator sport. The professional league, the National Football League (NFL), which consists of 32 teams, is very popular. Its championship game, the Super Bowl is annually watched by nearly half of US television households, and is also televised in other countries. College football is extremely popular, with many major colleges and universities playing NCAA (National Collegiate Athletic Association) Division I football, and consistently selling out huge stadiums. College games are widely televised and widely watched. Many colleges in lower NCAA divisions and the NAIA[?] (National Association of Intercollegiate Athletics[?]) have varsity football teams, as do most high schools. There are also amateur, club and youth teams (such as teams in the Pop Warner leagues).In addition to those leagues and teams, now there is a yearly American Football World Cup, which is held every year, at the same time and at the same host country for both men's American football and women's American football. 2003's World Cup will be held in The Bahamas.
Naming
The word football has a number of different meanings. In the United States football almost always means what, in the rest of the English-speaking world, is usually called American football (or in some cases Gridiron football). In most of the rest of the world, the word football means the game that is called soccer in the US, although it is occasionally called Association football or International football. Soccer, the most popular form of football world-wide, is also popular in the US, particlarly as a participation sport. It is played at all levels, youth, amateur, high school, college and professional. (see: football (soccer))In this article, the word football refers to American football.
Professional, college, and other leagues
Football is played at a number of levels in the United States. These include the following.- Professional (NFL) football
- Women's football
- Arena football - (professional) played indoors
- College football - played by many US colleges (very popular)
- High School football - played by most high schools
- Amateur and youth league football
- Flag football - non-tackle; almost exclusively amateur
- Touch football[?] - also non-tackle and almost exclusively amateur
The descriptions on this page are based primarily on the current rules of the National Football League (NFL, 1920-present). Differences with college rules will be noted.
NFL, college, high school, and amateur rules are similar, as were the rules of professional leagues that no longer exist. The Arena Football League (AFL, 1987-present) plays an indoor adaptation of American football. Flag football and touch football are non-tackle versions of American football.
Professional leagues that no longer exist include the World Football League (WFL,1974-75), the United States Football League (USFL,1983-1985), the XFL (XFL,2001), the All American Football Conference (1946-1949), the American Football League (AFL,1960-1969-merged with the NFL in 1970), and the World League of American Football (WLAF,1991-1993-now NFL Europe). Since 2000, there has been a surge of women's professional leagues.
The Game Play in American football consists of a series of individual plays of short duration, between which the ball is not in play. Substitutions are allowed between plays, which allows for a great deal of specialization, as coaches put in players they think are best suited for any particular situation. The game is very tactical and strategic. With 22 players on the field at a time, (eleven on each team), each with an assigned task for a given play, the strategies are complex.
Object of the game
The object of the game is to advance the ball to the opponents' end of the field and score points. The team with the most points when time has expired wins.Duration, kickoffs and free kicks
The game is 60 minutes long, divided into two halves separated by a halftime. Each half consists of two quarters, each 15 minutes long, between which teams change ends of the field. Teams also change ends of the field at halftime. If a game is tied at the end of regulation, overtime is played. Overtime periods are "sudden death", meaning that the teams that scores first, by any means, wins.A kickoff is a special play used to start each half, and also used to restart the game following a field goal, or a conversion attempt following a touchdown. One team kicks the ball, usually from its own 30-yard line, although a kickoff may occur elsewhere due to a penalty on the preceding play. (Note: the ball is usually kicked from the 35 yard line in college football). The ball must be kicked from the ground (not punted) and in bounds at least 10 yards away. Once the ball has traveled 10 yards upfield it can be fielded by either team. The ball is usually just kicked deep to the receiving team, but sometimes a team will attempt to recover its own kick, in a play that is known as an onside kick[?].
A free kick is used to restart the game following a safety, which doesn't happen often. The team that was trapped in its own end zone, and therefore conceded two points to the other team, kicks the ball from its own 20-yard line. A free kick may be punted if the kicking team so chooses.
Methods of scoring
Points can be scored in the following ways.- A field goal, worth 3 points, is scored by placing the ball on the ground and kicking it between the uprights of the goal posts. (If a field goal is missed, the ball is returned to the original line of scrimmage [in the NFL, the spot of the kick], and possession is given to the other team.)
- A touchdown, worth 6 points, is achieved when a player has legal possession of the ball within the opponents' end zone.
- One or two extra points may be scored following a touchdown. The team which scored the touchdown is given a conversion attempt (occasionally called a "try"). The ball is spotted at the 2 yard line (NFL) or 3 yard line (college), and the team which scored the touchdown is allowed to run a single play in which they may score either one or two additional points. The defending team can never score during a conversion attempt by the other team.
- An extra point, worth 1 point, is scored in the same way as a field goal is scored during regular play.
- A two-point conversion is scored in the same way as a touchdown is scored during regular play.
- A safety, worth 2 points, is scored when an opposition player attempts to run the ball out of his own end zone, and is either tackled or goes out of bounds before he has entered the field of play.
The Field The field is a rectangle 120 yards long and 53 1/3 yards wide, defined by sidelines running the length of the field and endlines running the width. There is a goal line ten yards in from each end line and parallel to it. The two goal lines are thus 100 yards apart. The area of the field between the goal lines is called the field of play. At each end of the field, the end zone is the area between the goal line and the end line.
Within the field of play, additional markings include yard markers, as well as inbound lines (also called hash marks), every yard the length of the field. The inbound lines (hash marks), which are short lines perpendicular to the yard markers, are 70-3/4 feet from the sidelines in the NFL. (Note: the hash marks are closer to the sidelines in college football) Every 5 yards, the yard markers run the width of the field, and every 10 yards, they are marked by numbers indicating the distance, in yards, from the nearest goal line.
At the center of each end line is a set of goal posts, which have two upright posts extending above a crossbar. The distance between upright posts is 18-1/2 feet, and the top of the crossbar is 10 feet above the ground.
Play Of The Game A game consists of many individual plays. The vast majority of these are scrimmage plays. Each play from scrimmage is one of a series of downs given to the team with possession. These two concepts, the concept of scrimmage, and the concept of downs, are fundamental to American football, and are what distinguish it, as well as Canadian football, from most other forms of football.
A set of downs begins with a first down, which is given to a team either after it has just gained possession on the previous play, or it has gained the necessary yardage from a previous set of downs. On a first down, the team with possession is given four downs to gain 10 yards (they have "a first and ten", meaning that it is first down, and they need ten yards to get another first down). The line a team must reach in order to gain a first down is technically called the line to gain, although it is commonly called first down yardage. The team with possession is called the offensive team, and the other team the defensive team.
Plays from scrimmage
Each down is a play from scrimmage. Prior to each play from scrimmage, the two teams line up on opposite sides of a line of scrimmage, which is defined by the spot of the ball from the previous play. The spot is, in most cases, the yard line at which the ball became dead on the previous play, plus or minus any penalty yardage. A down, or play from scrimmage, begins with a snap and ends when the ball becomes dead for any reason. A snap is either a handoff between the legs from the center to the quarterback, or it is a pass between the legs from the center to the quarterback, or possibly to a player other than the quarterback, such as a punter or a holder for a field goal attempt. The ball may become dead, ending the down, because a player in possession is tackled, or because his forward progress is stopped, or because he goes out of bounds, or because a forward pass goes incomplete.Advancing the ball There are two methods that can be used to advance the ball while still maintaining possession:
- Running with the ball - The quaterback, who is the player that normally has the ball following the snap, may run the ball but, more often, he either hands the ball, or throws a short pass to a running back, who then becomes the ball carrier. Most other players on the offense have blocking assignments.
- A forward pass - A forward pass may only be thrown on a play from scrimmage, and only from behind the line of scrimmage. It must be thrown to an eligible receiver (any player who is not an interior lineman). A completed pass is one caught by an eligible receiver. The player may run with the ball after catching it. An incomplete pass is any forward pass that either hits the ground or goes out of bounds, at which point the ball becomes dead, and is spotted at the preceding line of scrimmage for the following play. An interception is a pass caught by the defense, which transfers possession to the defending team, which may then run with the ball.
Fourth down situations
If a team uses all four of its downs without gaining the yardage for a first down, possession goes to the other team. Fourth down situations are therefore pivotal. The offense has three choices: "go for it", punt, or attempt a field goal.Things the offense may decide to do on fourth down:
- "go for it" - If the distance required for a first-down is short, a team may elect to go for it on fourth down, but it is often risky. The safe thing to do is usually to kick the ball.
- punt - A team will punt in order to gain better field position.
- attempt a field goal - Field goal attempts must be made with the ball on the ground (they cannot be punted), so a player called a holder holds the ball for a kicker. (In times past, a kicker may try a "drop kick" -- that is, drop the ball and kick it after it bounces off the ground -- and if the kicker kicks it through the goalposts, it is a field goal. This is difficult to do, as the ball is in the shape of a prolate spheroid and the bounce is unpredictable. Nowadays, the only time you will see this is by a hurried kicker after a broken play.) Failed field goal attempts, if they are short, can be returned by the opponent, but the ball usually goes past the end line and can't be returned. If the field goal attempt fails, the ball is spotted at the original line of scrimmage, and possession is given to the other team. (In the NFL, failed field goal attempts are spotted at the spot of the kick.)
A team will occasionally run a trick play on fourth down. They will line up as if to punt or attempt a field goal, but will instead run the ball or pass it in an attempt to pick up a first down.
Specialized units and players With its unlimited substitutions, American football is highly specialized, with most teams having three specialized units: an offensive unit, a defensive unit, and special teams. There are many specialized players within each units. Some players may only be used in certain situations. (for details see: offensive unit, defensive unit, special teams.)
Penalties Some of the more common penalties are listed below. In most cases the offending team will be assessed a penalty of 5, 10 or 15 yards, depending on the infraction. There may also be a loss of down for a penalty against the offense. A penalty against the defense may result in an automatic first down. In some cases, the offense will be given the option of declining the penalty and taking the yardage gained on the play. For some infractions by the defense, the penalty is applied in addition to the yardage gained on the play. A personal foul, which involves danger to another player, usually results in a 15 yard penalty.
- Note: The neutral zone is the space defined by lines drawn through the ends of the ball parallel to the yard lines when the ball is spotted and ready for play. No player may legally have any part of his body in the neutral when the ball is snapped, with the exception of the center.
Penalties against the offense
- False start (5 yards) - a lineman moving before the snap in a way that similuates the start of the play
- Illegal motion (5 yards) - having more than one back in motion at the snap
- Illegal shift (5 yards) - not being set before the snap
- Illegal formation (5 yards) - having less than 7 players on the line of scrimmage
- Delay of game (5 yards) - allowing too much time to elapse before the snap
- Inelligible receiver downfield (5 yards) - a lineman beyond the neutral zone prior to a forward pass
- Illegal forward pass (5 yards and loss of down) - thrown from beyond the neutral zone, or a second forward pass on the same play.
- Holding (10 yards) - illegal use of the hands or arms while blocking
- Offensive pass interference (10 yards) - interfering with a defender attempting to catch a pass
- Intentional grounding (10 yards and loss of down) - throwing the ball into the ground to avoid being tackled
- Clipping (15 yards) - an illegal block from behind below the waist
- Illegal block (15 yards) - usually a "crackback block".
Penalties against the defense
- Offside (5 yards) - making contact with an offensive lineman before the ball is snapped. or being in the neutral zone when the ball is snapped. The offense can decline the penalty and take the yardage gained on the play.
- Running into the kicker (5 yards) - during a kick from scrimmage
- Pass interference (automatic first down no more than 15 yards from previous line of scrimmage)
- Piling on (15 yards)
- Roughing the kicker (15 yards) -
- Roughing the passer (15 yards) - also called unnecessary roughness
Penalties against either team
- Too many players on the field (5 yards)
- Grabbing the face mask (5 or 15 yards) - if intentional, 15 yards; if unintentional, 5 yards. Just touching an opponent's face mask, without grabbing it, is not illegal.
Development of the game
American football in its current form grew out of a series of three games between Harvard University and McGill University of Montreal in 1874. McGill played by the Rugby Union code while Harvard played the Boston Game[?], which was closer to Association Football. As often happened in those days of far from universal rules, the teams alternated rules so that both would have a fair chance. The Harvard players liked having the opportunity to run with the ball, and in 1875 persuaded Yale University to adopt Rugby Union rules for their annual game. In 1876 Yale, Harvard, Princeton, and Columbia formed the Intercollegiate Football Association[?], which used the Rugby Union code, except for a slight differnce in scoring.
In 1880 Walter Camp introduced the scrimmage in place of the rugby scrum. In 1882 the system of downs was introduced to thwart Princeton's and Yale's strategy of controlling the ball without trying to score. In 1883 the number of players was reduced, at Camp's urging, to eleven, and Camp introduced the soon standard arrangement of a seven-man offensive line with a quarterback, two halfbacks, and a fullback.
By the 1890s interlocking offensive formations such as the flying wedge had made the game extremely dangerous. Despite restrictions on the flying wedge and other precautions, in 1905 eighteen players were killed in games. President Theodore Roosevelt informed the universities that the game must be made safer. However, it was not until 1910, and after further deaths, that interlocking formations were outlawed.
The forward pass was introduced in 1906. In 1912 the field was changed to its current size, the value of a touchdown was increased to 6 points, and a fourth down was added. The game had achieved its modern form.
- American football glossary
- List of American football players
- Football
- List of defunct sports leagues
- NFL History and the basics (http://ww2.nfl.com/basics/history_basics)
- NFL Digest of Rules (http://ww2.nfl.com/fans/rules/index) - (a basic guide)
- NCAA Playing Rules (http://www.ncaa.org/library/rules) (complete college football rules are available as a pdf file)
- Guide to referee signals (http://www.nickstudio.com/~joe/nctfl/secondary_html/official_signals.htm)
All Wikipedia text is available under the terms of the GNU Free Documentation License
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