Football is an all contact sport that envolves 2 teames and one ball. The idea is that when your team is on offence (your trying to score point) you must either run or pass the ball down field. The field is 100 yards, you have a play clock wich is 15 seconds, that is the amount of time you have to make your play. When this clock runs out you get a penalty (delay of game) and the line of scrimage (where the ball is placed) is moved back 5 yards. There is a game clock that runs as the plays do, if you run the ball the clock will continue to count down, if you pass it will stop. If your team is on defence you are trying to stop the opposing team from advancing down the field. A sac is when the offencive quarter back is tackled befor the ball leaves his hands. If a player s hit and the ball is either stripped or droped this is called a fumble. At wich time any player can pick the ball up and proceed to run it down field. A field goal is when the ball is kicked through two posts. A 2 point conversion is when (after scoring) the ball than ran or passed into the inzone.