Friction

Force opposing relative motion between surfaces.

drag force

Friction is the force that opposes the relative motion of solid surfaces, fluid layers, or material elements sliding against each other.

/ˈfrɪkʃən/

Friction comes from the Latin word 'frictio,' meaning rubbing.

Friction is like when you try to slide a box across the floor - it's that force that makes it harder to move.

What is friction? It's a force that opposes motion between surfaces
How does friction work? Rough surfaces create more friction than smooth ones
What are some examples of friction? Walking, brakes on a car, and sliding are all examples

Force

Static friction Kinetic friction

mechanical process physical phenomenon