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[Phys-L] Re: Energy & Projectile Lab

There is an interesting article in TPT (Sep. 2004 p. 366, also see
Letter in Dec. 2004 p. 516) about the fact that a ball rolling off a
table will receive an extra kick from the forward component of the
normal force as the ball rolls over the edge of the table. Michael
Edmiston says he always manages to hit Lincoln's cheek. I am puzzled
as to why this extra kick doesn't cause the ball to slightly
overshoot. What is the shape of the lip of the table off which you
are rolling the ball? There is a graph showing that the effect is
only significant for speeds below about 20 cm/s. How fast is your
ball going when it reaches the edge of the table? Just curious; you
may wish to investigate this effect next time you run the demo. Carl
Carl E. Mungan, Asst. Prof. of Physics 410-293-6680 (O) -3729 (F)
U.S. Naval Academy, Stop 9C, Annapolis, MD 21402-5040
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