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defensive team
the team not in possession of the ball
down
attempt or try to move the ball ten yards; offense gets four of these to move the ball ten yards; if they don't advance it that far, they lose possession of the ball
end line
the boundary line that runs the width of the field along each end
fumble
when a ball carrier loses possession by dropping the ball or having it knocked away before a play ends
goal line
a line drawn across the width of the field, 10 yards inside each end line, which a team must cross with the ball to score a touchdown
interception
a pass caught in the air (picked off) by a defender whose team immediately gains possession of the ball and becomes the offense
line of scrimmage
an imaginary line which no player may cross before the snap; each team has its own one of these, separated by a neutral zone which is the length of the football as it lies on the ground
offensive team
the team in possession of the ball
offside
when any part of a player's body is beyond his line of scrimmage when the ball is snapped; this is a foul punishable by a 5 yard penalty
penalty
when a team commits one of these, the referee will throw a yellow flag as an indicator of this; a team can choose to accept it and redo the down or decline it and move on to the next down
spiral
a ball or kick with a spin which propels it further with more accuracy; the ball points the same direction throughout its flight
tackle
the act of a defensive player taking an offensive player to the ground
touchback
when a player who gains possession of a ball in his own end zone kneels to the ground and automatically starts the next play at his own 20-yard line; also awarded if his opponent kicks the ball across the end line
forward pass
throwing the ball forwards; legal only once per play; must be thrown from behind the line of scrimmage and caught only by an eligible receiver
kickoff
the way that play is begun to start both halves and after every score
long snap
a method of centering the ball to the quarterback or a holder for a place kick or punter; the typical distance between the center and player receiving the ball is 7 yards for quarterback and holder for place kick and 13 yards for punter
place kick
one player places the ball on the ground, end first, and holds it lightly with the hand or fingers; his teammate tries to kick it between the uprights of the goal post
punt
a type of kick where the kicker drops the ball through the air and kicks it before it hits the ground; this will usually occur on a fourth down when the offensive team is not in position to score or chooses not to go for a first down
receiving
catching the ball either as an offensive receiver, defender or a special team player on kick return or punt return
120 yards
field length from end line to end line
100 yards
field length from goal line to goal line
53 1/3 yards
width of the field
5 yards
distance between yard lines parallel to the goal line
23' 4"
length of the goal post crossbar
10'
height of the goal post crossbar
3" to 4"
diameter of the uprights on the goal post crossbar
20'
length of the uprights on the goal post crossbar
11
number of players on each team on the field at a time
touchdown
made when any player carries the ball across their opponent's goal line or receives a pass in the end zone
field goal
made when an offensive player makes a place kick that passes entirely between the goal post
safety
made when the team with the football loses it out of its own end zone or is tackled in possession of the ball while in the end zone
6
number of points a touchdown is worth
3
number of points a field goal is worth
2
number of points a safety is worth
2 point conversion
an offensive play that can occur from the 3 yard line after a touchdown; if the ball is run or thrown complete into the end zone, 2 points are earned
extra point
a point that can be earned when a successful kick occurs from the 3 yard line between the uprights after a touchdown
anywhere behind their scrimmage line
Where can defensive players line up?
any player
Which players can run with the ball?
the two ends and the backs
Which players are eligible receivers and are permitted to catch the ball?
unlimited
Is the number of substitutions permitted for each team limited or unlimited?
when the ball is dead
When can players enter and exit the field and substitutions occur?
their own team's side between the end lines
To where must players leaving the field exit?
before the next play begins
When must players leaving the field exit?
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