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PhysicsClassical Physics

A Force That Opposes the Motion of an Object: Which Friction?

Identify the friction in Pearson's moving-surface question, then distinguish sliding contact from static, rolling, and fluid resistance.

Question

Which type of friction resists the motion of an object that is already moving along a surface?A. Rolling frictionB. Fluid frictionC. Kinetic frictionD. Static friction

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Evidence boundary

This answer follows the exact Pearson multiple-choice version and its intended sliding-contact interpretation. It does not claim that every moving object experiences kinetic friction, or that kinetic friction is the only possible resistive force.