Cerebral Palsy maybe/maybe not

A heavy smooth steel ball is rolled down a nicely made smooth incline. A camera is used to video the ball’s acceleration and travel. Data (x & y timed locations of ball center), frame by frame, are plotted. A jagged graph emerges. Jagged? A JAGGED graph? From that ? Some unusual gravity thing going on? Forget the speed. What could make that ball so inertially insignificant so as to do anything in a non-smooth, jagged, way? What kind of ball is this???? Or maybe the camera was not secured properly and was jiggling. Look below. This is a computer generated knee angle curve of a normal person walking on a gymnasium floor with a HAND HELD camera recording the walk. White line. Do we suspect the camera person of having a tremor?

Actually, computed perfect data, was passed through a program to mimic possible recorder vibration. The results of this are quite visually obvious . But our inertial facts allow us a better computation of what happened, a far