I remember a section from Feynman's "Surely you are joking..." where he says he went over a textbook chapter for Newton's laws and found a graph, purportedly fr

I remember a section from Feynman's "Surely you are joking..." where he says he went over a textbook chapter for Newton's laws and found a graph, purportedly from an experiment where they rolled a ball down an inclined plane. He says the graph followed the equations perfectly, with a little Gaussian noise sprinkled in, but they had neglected to account for the rotational inertia of the ball, and so he concluded that the 'experiment' was faked.