i have only been watching nfl for a couple of years but as my understanding goes there are no limitations on a qb crossing the line of scrimmage with the exception that should he cross the line of scrimmage before the ball is snapped his team will inccur a penalty. but as i say he may cross the line for a draw play for instance or on a trick play or just if he sees no alternative though once he is past the line of scrimmage (his entire body pads an all) he may not make a forward pass only backwards or lateral like any other player on the field
A sack is when the quarterback is tackled behind the line of scrimmage before he can throw a forward pass/lateral. Tackling the quarterback behind the lime of scrimmage on a running play is not considered a sack.
A sack is when a quarterback is tackled for a loss of yardage.
When the defense tackles the quarterback behind the line of scrimmage for a loss.
If the ball fails to pass the line of scrimmage, it is penalized as Intentional Grounding. The player who hit the quarterback is still awarded the sack.
· audible (football quarterback calls an audible at the line of scrimmage)
If a quarterback and the entire ball are in front of the line of scrimmage then a forward pass can no longer be thrown but a lateral is still a legal play. However, by the act of crossing the line of scrimmage, the quarterback does not lose the right to throw a forward pass as long as after crossing the line scrimmage, the ball returns behind and is thrown from behind the line scrimmage.
QB (quarterback) instructs his teammates to listen carefully at the line of scrimmage because he may call another play, or his call at the line of scrimmage will be the play.
That depends on the angle the ball travelled. If the receiver is behind or exactly to the side of the quarterback and the ball travels at an angle parallel to or away from the line of scrimmage, the throw is considered a lateral and would be a fumble if the receiver did not catch it. If the receiver is in front of the quarterback and the ball travels at an angle towards the line of scrimmage, the throw is considered a forward pass and would be an incomplete pass.
No, once the ball crosses the line of scrimmage, no passing plays can be made.
yes
When a defensive player tackles a quarterback behind the line of scrimmage as he is trying to throw the football .... that is called a sack.
When they are five yards behind the line of scrimmage they call that the SHOTGUN formation.