What is 'unnecessary roughness'?

What is 'unnecessary roughness'?

Darrin Chiaverini (Football Coach and Professional Athlete) gives expert video advice on: What is a 'delay of game'?; What is 'offsides'?; What is 'encroachment'? and more...

Unnecessary roughness is when a player is down by contact and a offensive-defensive player tends to hurt the other guy after the whistle. It's also when a quarterback throws the ball and the ball's out of his hand and the defensive tackle hits him after the whistle or after the ball's released. It's a 15 yard penalty and an automatic first down.