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Mechanical Engineering QUESTION #2551
Question 1
Kinetic friction coefficient \(\mu_k\) versus static friction coefficient \(\mu_s\) for identical surfaces satisfies:
  • Always \(\mu_k > \mu_s\)
  • Always \(\mu_k = \mu_s\)
  • Always \(\mu_k < \mu_s\)✔️
  • Can be either, depending on normal force magnitude
Correct Answer Explanation
Kinetic (sliding) friction is always less than maximum static friction: \(\mu_k<\mu_s\). Once relative motion begins, the friction force drops because molecular adhesion bonds are continuously broken rather than built up.