When the ball carrier is tackled and does not pass ball to teammate or the ball is out of bounds, the play is called a scrum, and the yard line where the last play was downed is called the line of scrimmage. -----
In American football, draw a line from sideline to sideline where the ball is put into play on each down and that is the line of scrimmage.
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Yes ... when an official places the ball on the ground and the referee blows his whistle to signify that a play can begin ... if you think about a straight line going from one sideline to the other that passes through the front tip of the ball and is parallel to the goal lines ... that is the line of scrimmage. In American football, no player is allowed past the line of scrimmage until the ball is snapped and put into play.
Its were the ball is placed before each play. If the ball has traveled the line moves. Also only so many eligible Receivers can be on the line.
When the ball is thrown forward over the line of scrimmage. This is allowed only once per play.
the running back is a pretty vital position. his job is to carry the football up the field on offense by taking either a hand off or a toss from the quarterback behind the line of scrimmage. He offers an alternative to passing. Notable examples include Ladanian Tomlinson, Adrian Peterson, Brandon Jacobs, Deuce McAlister, etc. The running back also can be sent out on passing routes as a receiver, or can stay back to block any defenders that may try to get the QB or as a blocker for the fullback/recievers.
An audible.
Backs are called backs because they are in back of the line of scrimmage. In the old tee-formation, the farthest offensive guy from the line of scrimmage was the fullback, because he was all the way at the end of the tee. Similarly, the halfback was positioned halfway between the fullback and the line of scrimmage, and the quarterback was positioned one-fourth of the way between the line of scrimmage and the fullback. Other formations, of course, are used these days, but the old names for the positions has persisted.
When the defense tackles the quarterback behind the line of scrimmage for a loss.