Ramp It Up! with Netwon's Laws

In Ramp It Up! we are investigating Newton's principles of motion. Student teams in my different classes are independently investigating what happens to an object as it rolls down a ramp. We have stated "what will happen to the motion of the ball?" as our guiding question. The ball seems to travel down the ramp with less time with a higher angle. But that leads us to question the relationship between the "steepness" and the time the ball travels down the ramp. Is there a mathematical relationship between the two variables? Hopefully the classes will uncover some of the scientific principals behind the motion of objects.