Question

Identify the correct statement.

• A. Static friction depends on the area of contact
• B. Kinetic friction depends on the area of contact
• C. Coefficient of static friction does not depend on the surfaces in contact
• D. Coefficient of kinetic friction is less than the coefficient of static friction
• E. Coefficient of kinetic friction does not depend on the surfaces in contact

Answer 1

Answer: (D)

Both static and kinetic friction are independent of the area of contact.
Coefficient of static friction depends on the surfaces in contact. $\therefore$ ${\mu }_k$ $<{\mu }_s$