Friction type when a body is already moving Identify the correct term for the frictional force acting on a body while it is in motion relative to the surface. Choose the correct option.

Given data
The body is already in motion relative to the contact surface.

Concept/Approach
Friction is categorized by the motion state: static (no slip), limiting (maximum static, just before slip), kinetic/dynamic (during sliding), and rolling (during rolling contact).

Step-by-step
Motion is occurring ⇒ sliding friction applies.Sliding friction is also called kinetic or dynamic friction.

Common pitfalls
Confusing limiting friction (threshold of motion) or static friction (no slip) with the friction during sliding.

Final Answer
dynamic friction