The deadly auto wreck that claimed the life of local high school science teacher Donald Vaughan, 47, would have neatly and succinctly illustrated the basic laws of classical mechanics to his fourth-period physics class, sources reported Monday. Having struggled to grasp the rule stating that force is equal to mass times acceleration, Vaughan's students would reportedly have been given an elegant case study in the concept were he still alive to describe the way his 1992 Mazda Protg lethally collided with a large oak tree late Saturday night. Sources also reported that, had Vaughan's students only witnessed their teacher's head separate violently from his spinal cord, they might have finally understood the fundamental idea that an object in motion will tend to stay in motion. 