The yellow one
The defensive line in American football has many jobs. First is to attempt to break through the opponents offensive line in order to tackle the quarterback. Others on the defensive line are given the task of running down field with a receiver to try to intercept the ball.
When you get 10 yards ahead of the original line of scrimmage
That line is called the line of scrimmage.
If the offense recovers the fumble and advances it beyond the original first down line, yes, it is a first down. If the ball is not advanced past the original first down line then the next play is the down after the one that the fumble occurred on. For example, if a running back fumbles the ball on second down and an offensive line man recovers the fumble but does not advance the ball beyond the original first down line, it is then third down. If the defense recovers the fumble, then it is an automatic first down wherever the player that recovered the fumble is downed.
Yes, the ball would be spotted the farthest the player went, unless they went backwards on their own will.
If, after gaining a first down, a player is tackled at the one yard line, then it would be 1st and 1. Some may consider this 1st and goal.
That is the line of scrimmage, the line in which the team with the ball begins their play on. it may also be the 1st down line
A block down field beyond the line of scrimmage
The game of football played in America was developed through rules started by Walter Chauncey Camp. His main contributions were the line of scrimmage and downs as in first down etc.
· audible (football quarterback calls an audible at the line of scrimmage)
A loss of yardage in football is when someone on the team holds the football in his/her hand(s)/arm(s) and someone on the other team tackles the person with the football before the person with the football can advance across the line in which the play started. For example: the team with the football start on the fifty yard line and they need to advance the ball to the forty yard line for a first down. The football gets snapped to the quarterback. The quarterback has two options: run with the football or throw the football to someone on his/her team so the team can attempt to get the ball across the forty yard line. The quarterback notices that someone on the other team is running at him/her and runs backwards to the forty yard line. Before the quarterback has the chance to either run with the football or throw the football, the person tackles the quarterback at the forty yard line resulting in a ten yard loss.
Walter Camp is considered the "Father of American Football". He introduced the line of scrimage and down-and-distance rules to rugby.