Travel or not?

[Philz]

Is it a travel if you slide, say after you catch a pass or stop your dribble and your momentem along with maybe a slick floor or bad traction on your shoes? I was working a NJB high school game last week and my partner called traveling a few times on those type situations and during a time-out our assigner that was watching the game called us over and said to let those go.
One player though did it 3 times and once he must have slid 3 or 4 feet. Also how bout when someone goes to the floor with the ball. If he rolls over is that traveling? What should you be looking for there? What if a player with the ball feet slides right out below him and he lands butt first on the floor. Is that traveling?