Which term is not one of the three listed friction types: Kinetic, Static, Rolling?

Which term is not one of the three listed friction types: Kinetic, Static, Rolling?

• A. Kinetic
• B. Dynamic
• C. Static
• D. Rolling

Answer: (B)

Static friction, kinetic (sliding) friction, and rolling friction are the standard categories of friction. Static friction acts to prevent motion when surfaces are at rest relative to each other. Kinetic friction comes into play when surfaces slide past one another. Rolling friction occurs when an object rolls over a surface, typically smaller due to less deformation and contact area. The term that does not fit as one of these three is dynamic, because it isn’t a distinct friction category in this common framework (though some contexts use it to mean kinetic friction). So the correct choice is dynamic.

Static friction, kinetic (sliding) friction, and rolling friction are the standard categories of friction. Static friction acts to prevent motion when surfaces are at rest relative to each other. Kinetic friction comes into play when surfaces slide past one another. Rolling friction occurs when an object rolls over a surface, typically smaller due to less deformation and contact area. The term that does not fit as one of these three is dynamic, because it isn’t a distinct friction category in this common framework (though some contexts use it to mean kinetic friction). So the correct choice is dynamic.