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

The correct option is D Coefficient of kinetic friction is less than the coefficient of static friction.

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