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

Answer 1

Answer: (D)

Coefficient of kinetic friction is less than the coefficient of static friction

Answer 2

Both static and kinetic friction are independent on the area of contact.

Coefficient of static friction depends on the surfaces in constant $\mu_{k} < \mu_{s}$