I'm writing to comment on the article published in the March edition of The Physics Teacher titled “Choose Wisely: Static or Kinetic Friction—The Power of Dimensionless Plots.” As I was reading the article, something caught my eye that I couldn't reconcile with. It was the phrase on page 160 in the first column near the bottom. The statement was that the experimental value for the coefficient of kinetic friction was “unexpectedly greater than the coefficient of static friction!”
REFERENCES
1.
Daniel
Ludwigsen
and Kathryn
Svinarich
, “Choose wisely: Static or kinetic friction—The power of dimensionless plots
,” Phys. Teach.
47
, 158
–161
(March 2009
).
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© 2009 American Association of Physics Teachers.
2009
American Association of Physics Teachers
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