Kinetic (sliding) friction (fk = μk N)
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fk = μk N
What each symbol means
| Symbol | What it stands for |
|---|---|
| N | Normal (N) |
| fk | Kinetic friction (N) |
| μk | Coefficient of kinetic friction |
When to use this
During sliding, kinetic friction magnitude ≈ μkN, opposes relative velocity.