Kinetic Friction Formula |
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\( f_k \;=\; \mu_k \cdot F_n \) (Kinetic Friction) \( \mu_k \;=\; \dfrac{ f_k }{ F_n }\) \( F_n \;=\; \dfrac{ f_k }{ \mu_k }\) |
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| Symbol | English | Metric |
| \( f_k \) = Kinetic Friction | \( lbf \) | \(N\) |
| \( \mu_k \) (Greek symbol mu) = Kinetic Friction Coefficient | \( dimensionless \) | \( dimensionless \) |
| \( F_n \) = Normal Force | \( lbf \) | \(N\) |
Kinetic friction, abbreviated as \(f_k\), also called dynamic friction or sliding friction, is the force that opposes the relative motion of two surfaces that are moving with respect to each other. When an object is in motion, the irregularities on the surfaces in contact slide past each other, creating a resistance to motion. The strength of kinetic friction is generally less than the strength of static friction, but it depends on the materials in contact, the force pressing the two surfaces together, and the roughness of the surfaces. Kinetic friction is also affected by the speed of the moving object, it typically increases as the speed of the object increases.
