As a consultant working for a manufacturing firm, you are asked to recommend a shoe that would reduce the likelihood that the factory workers will slip if the floor gets wet. At a critical instant in time, the vertical force exerted on the ground by a factory worker is 800N and the horizontal force is 300N. From shoe-floor test, you determine that the coefficient of kinetic friction on the wet floor is 0.7 and the coefficient of static friction is 0.8. Above what force would slip occur?
a. 240N
b. 300N
c. 640N
d. 800N
Answer: c
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Biomechanics
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