In pro and College Football, there are seven: A referee, back judge, side judge, line judge, field judge, umpire, and head linesman. Check out this link to read about their specific duties on the field:
http://en.wikipedia.org/wiki/Official_(American_football)
on the foot ball field
With the side of your foot near the ball of your big toe
im pretty sure its foot-ball.
lengths - materials distance - foot ball field
bob
ball of foot means a ball has a foot stuck. to it so there is a diffrens beetween foot ball and ball foot. foot ball is a game with a ball. but ball of foot is when the foot is stuck to the ball! get it?
A foot ball feild
Well, it's hard to explain how fast, but say if you were in a 50 foot wide field and you threw a ball across the field, it would take them about 20 seconds to get to the ball!
Yes, as long as his or her foot is planted on the ground and does not move. There must be no "kicking" motion as it makes contact with the ball.
Just over one acre if you don't count the end zones
American football = 100 yards = 300 feet = 3600 inches
It is a Zulu word.