Question

Which of the following statements is correct about friction?

• 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)

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