yes or if one knee touches the ground
No ... if the shoulder, elbow, forearm, or wrist touch the ground the ball carrier is also considered down.
In the NFL, if any part of the player's body except for the hands or feet touches the ground, and the player is in contact with an opposing player, the play is over. In college football, the player would be down and the ball would be dead, regardless of whether an opposing player made contact with him.
you dont always need college to be a football player but you have to go to college to play college football
The runner is considered down when either a: His forward progress stops or b: any part of his body other than his foot or hand touches the ground AND he is touched by a player of an opposing team. There is no "down by contact" in college football. That's only in the pros. When a college player goes down he cannot get up and continue running, period. He does not have to be touched by an opposing player to be considered down.
If it's a hand, no. If it's an elbow (or arm), yes.
college football is when you are in college and pro football is when you are out of college and also in pro football you get paid but not college football. you can get into pro by being a college player and getting drafted into pro.
who is the oldest active college football player right now?
If someone is a high school football player why would he be eligible to play in a college football game?
as long as no opposing player makes contact of any kind with that player, the ball is still live. The above is true only in the NFL. In college or high school, the play (and therefore the down) is over when any part of the ball carrier's body touches the ground, other than a hand or a foot.