Which type of friction occurs when surfaces slide past one another?

Which type of friction occurs when surfaces slide past one another?

• A. Static Friction
• B. Rolling Friction
• C. Kinetic Friction
• D. Centrifugal force

Answer: (C)

When two surfaces move relative to each other, the friction involved is kinetic friction. This type of friction arises from the continual slipping of microscopic surface asperities as motion occurs, and it acts opposite to the direction of travel. The force is typically described by F_f = μ_k N, where μ_k is the coefficient of kinetic friction and N is the normal force. Static friction is what resists the start of motion (before slipping occurs), and rolling friction is relevant when objects roll rather than slide (like a wheel). Centrifugal force isn’t a friction type; it’s a supposed force that appears in rotating frames and isn’t the contact friction at play here. In practice, once sliding begins, kinetic friction governs the resistance.

When two surfaces move relative to each other, the friction involved is kinetic friction. This type of friction arises from the continual slipping of microscopic surface asperities as motion occurs, and it acts opposite to the direction of travel. The force is typically described by F_f = μ_k N, where μ_k is the coefficient of kinetic friction and N is the normal force.

Static friction is what resists the start of motion (before slipping occurs), and rolling friction is relevant when objects roll rather than slide (like a wheel). Centrifugal force isn’t a friction type; it’s a supposed force that appears in rotating frames and isn’t the contact friction at play here. In practice, once sliding begins, kinetic friction governs the resistance.