What kind of friction do you want between tires and surface you are riding on?

• A. Static Friction
• B. Kinetic Friction
• C. Rolling Friction
• D. Sliding Friction

Answer: (C)

Rolling friction is the friction that opposes the motion of a wheel as it rolls, while allowing the tire to turn and grip the surface without sliding. This is what you want when riding because it provides the necessary grip to propel, brake, and steer, but with minimal energy loss compared to sliding. If the tire were to slide, you'd be in kinetic (sliding) friction, which wastes more energy and increases the chance of losing control. In short, rolling friction lets you roll smoothly and efficiently while maintaining control.