football lines

football lines

In American and Canadian football a line of scrimmage is an imaginary transverse line crossing the football field across its narrower dimension, beyond which a team cannot cross until the next play has begun. Its location is based on the spot where the ball is placed after the end of the most recent play and following the assessment of any penalty yards. A line of scrimmage is parallel to the goal lines and touches one edge of the ball where it sits on the ground prior to the snap. Under NFL and NCAA rules, there are actually two lines of scrimmage at the outset of each play: one that restricts the offense and one that restricts the defense. The area between the two lines (representing the length of the ball as extended to both sidelines) is called the neutral zone. Only the center, the offensive player who snaps the ball, is allowed to have any part of his body in the neutral zone. In order for there to be a legal beginning of a play, a certain number of the players on the offensive team, including certain eligible receivers, must be at, on or within a few inches of their line of scrimmage.
In Canadian football the team on defense must line up no nearer than a yard to the line of scrimmage. In American football they must only be beyond the line.
Many fans and commentators refer colloquially to the entire neutral zone as the "line of scrimmage," although this is technically not correct. Others use the general term to refer specifically to the defensive line of scrimmage, since it is the line relevant to the measurement of progress toward the goal. Referees, when explaining a penalty, will refer to "the previous spot" instead of the "line of scrimmage" in order to avoid confusion.
Sportvision provides a product called 1st & Ten which allows broadcasts of American football to include a visible line which may represent the line of scrimmage or the minimum distance that the ball must be moved for the offensive team to achieve a first down.
American football, known in the United States and Canada simply as football,[1] is a competitive team sport known for mixing strategy with physical play. The object of the game is to score points by advancing the ball[2] into the opposing team's end zone. The ball can be advanced by carrying it (a running play) or by throwing it to a teammate (a passing play). Points can be scored in a variety of ways, including carrying the ball over the goal line, catching a pass from beyond the goal line, tackling an opposing ball carrier in his own end zone, or kicking the ball through the goal posts on the opposing side. The winner is the team with the most points when time expires at the end of the last play.
American football is also played outside the United States. National leagues exist in Germany, Sweden, Japan, Mexico and the United Kingdom. The National Football League ran a developmental league in Europe from 1991–1992 and 1995–2006.
The history of American football can be traced to early versions of rugby football and soccer. Both games have their origin in varieties of football played in the United Kingdom in the mid-19th century, in which a ball is kicked at a goal and/or run over a line. Also like soccer American football has twenty two players on the field of play. Further more, player position references are used such as the term "halfback" and "fullback".
American football resulted from several major divergences from rugby football, most notably the rule changes instituted by Walter Camp, considered the "Father of American Football". Among these important changes were the introduction of the line of scrimmage and of down-and-distance rules. In the late 19th and early 20th centuries, gameplay developments by college coaches such as Amos Alonzo Stagg, Knute Rockne, and Glenn "Pop" Warner helped take advantage of the newly introduced forward pass. The popularity of collegiate football grew as it became the dominant version of the sport for the first half of the twentieth century. Bowl games, a college football tradition, attracted a national audience for collegiate teams. Bolstered by fierce rivalries, college football still holds widespread appeal in the US.[3][4][5]
Walter CampThe origin of professional football can be traced back to 1892, with William "Pudge" Heffelfinger's $500 contract to play in a game for the Allegheny Athletic Association against the Pittsburgh Athletic Club. In 1920 the American Professional Football Association was formed. This league changed its name to the National Football League (NFL) two years later, and eventually became the major league of American football. Primarily a sport of Midwestern, industrial towns in the United States, professional football eventually became a national phenomenon. Football's increasing popularity is usually traced to the 1958 NFL Championship Game, a contest that has been dubbed the "Greatest Game Ever Played". A rival league to the NFL, the American Football League (AFL), began play in 1960; the pressure it put on the senior league led to a merger between the two leagues and the creation of the Super Bowl, which has become the most watched television event in the United States on an annual basisAmerican football is played on a field 360 by 160 feet (109.7 m × 48.8 m) wide. The longer boundary lines are sidelines, while the shorter boundary lines are end lines. Near each end of the field is a goal line; they are 100 yards (91.4 m) apart. A scoring area called an end zone extends 10 yards (9.1 m) beyond each goal line to each end line.
Yard lines cross the field every 5 yards (4.6 m), and are numbered every 10 yards from each goal line to the 50-yard line, or midfield (similar to a typical rugby league field). Two rows of short lines, known as inbounds lines or hash marks, run parallel to the sidelines near the middle of the field. All plays start with the ball on or between the hash marks.
At the back of each end zone are two goalposts (also called uprights) connected by a crossbar 10 feet (3.05 m) from the ground. The posts are, for high skill levels 222 inches (5.64 m) apart. For lower skill levels, these are widened to 280 inches (7.11 m).
Each team has 11 players on the field at a time. However, teams may substitute for any or all of their players, if time allows, during the break between plays. As a result, players have very specialized roles, and, sometimes (although rarely) almost all of the (at least) 46 active players on an NFL team will play in any given game. Thus, teams are divided into three separate units: the offense, the defense and the special teams.
Similar to association football, the game begins with a coin toss to determine who will kick off to begin the games and which goal each team will defend. The options will be presented again to start the second half; the choices for the first half do not automatically determine the start of the second half. The referee will conduct the coin toss with the captains (or sometimes coaches) of the opposing teams. The team that wins the coin toss has three options:
They may choose to either receive the opening kickoff or to kick off They may choose which goal to defend They may choose to defer the first choice to the other team and have first choice to start the second half.[7] Whatever the first team chooses, the second team has the option on the other choice (for example, if the first team elects to receive at the start of the game, the second team can decide which goal to defend).
At the start of the second half, the options to kick, receive, or choose a goal to defend are presented to the captains again. The team which did not choose first to start the first half (or which deferred its privilege to choose first) now gets first choice of optionsA standard football game consists of four 15-minute quarters (12-minute quarters in high-school football and often shorter at lower levels), with a half-time intermission after the second quarter. The clock stops after certain plays; therefore, a game can last considerably longer (often more than three hours in real time), and if a game is broadcast on television, TV timeouts are taken at certain intervals of the game to broadcast commercials outside of game action. If an NFL game is tied after four quarters, the teams play an additional period lasting up to 15 minutes. In an NFL overtime game, the first team that scores wins, even if the other team does not get a possession; this is referred to as sudden death. In a regular-season NFL game, if neither team scores in overtime, the game is a tie. In an NFL playoff game, additional overtime periods are played, as needed, to determine a winner. College overtime rules are more complicated and are described in Overtime (sport).

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