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Q: The coefficient of friction is ______ for smooth surfaces.
  • A. 1.5
  • B. infinity
  • C. zero
  • D. 1.0
Correct Answer: Option C - Typical values for coefficients of friction are around 0.05 for smooth surfaces. 1 for very rough surfaces. The coefficient of kinetic friction is usually smaller than the coefficient of static friction for any particular interface.
C. Typical values for coefficients of friction are around 0.05 for smooth surfaces. 1 for very rough surfaces. The coefficient of kinetic friction is usually smaller than the coefficient of static friction for any particular interface.

Explanations:

Typical values for coefficients of friction are around 0.05 for smooth surfaces. 1 for very rough surfaces. The coefficient of kinetic friction is usually smaller than the coefficient of static friction for any particular interface.