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Because football is a high-contact sport requiring a balance between offense and defense, many rules exist that regulate equality, safety, contact, and actions of players on each team. It is very difficult to always avoid violating these rules without giving up too much of an advantage.
The first American football game was played on November 6, 1869, between two college teams, Rutgers and Princeton, using rules based on the rules of soccer at the time. A set of rule changes drawn up from 1880 onward by Walter Camp , the "Father of American Football", established the snap , the line of scrimmage , eleven-player teams, and the ...
A pair of officials at a Maryland high school football game in September 2008. White knickers used to be worn by officials; black trousers are now standard.. For ease of recognition, officials are usually clad in a black-and-white vertically striped shirt and black trousers with a thin white stripe down the side (this was formerly white knickers with black/white striped stirrup stockings or ...
The offense is required to set up a formation before a play, subject to several rules: The formation must have at least 7 players on the line of scrimmage. [1] The 7 players are not required to be next to each other and may spread out across the width of the field, but this is rare; most offenses place at least 5 players together in a continuous line.
A later evolution of the original 5-2 is the Oklahoma 5–2, which ultimately became the professional 3-4 when the defensive ends of the original 5-2 were substituted over time for the outside linebackers of the 3–4. [43] The differences between the Oklahoma 5-2 and the 3-4 are largely semantics.
The first American football game was played on November 6, 1869, between two college teams, Rutgers and Princeton, using rules based on the rules of soccer at the time. A set of rule changes drawn up from 1880 onward by Walter Camp , the "Father of American Football", established the snap , the line of scrimmage , eleven-player teams, and the ...
There is a goal centered on each end line, with a crossbar 10 feet (3.0 m) above the ground and goalposts 18 feet 6 inches (5.64 m) apart (in college and the NFL) extending at least 35 feet (11 m) above the crossbar. Between the goal lines, additional lines span the width of the field at 5-yard intervals.
American 7s Football League (A7FL) is a semi-professional league which plays a seven-man version of gridiron football, while the American Flag Football League plays a variant of American football where, instead of tackling players to the ground, the defensive team must remove a flag or flag belt from the ball carrier to end a down.