How friction and gravity apply to Newtons Laws
Does the surface of a track affect the time it takes to get to the bottom?
Yes the surface of the track would affect the time it takes to get to the bottom, because if the track is smooth everything will go nice and smooth without any error. Then if the track is all rocky, uneven, and bumpy it would slow down the speed because it would create stops in the track that the objects going through the track would have to avoid or to blow right over. So that would slow down the same, so yes the surface of anything with a object on it determines the speed of the track.