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Frictional Force (Coulomb's Law of Friction)

Frictional Force Equation


$$ F_f = \mu \cdot F_n $$ where:

Ff   =   Friction Force   (N)

μ   =   Coefficient of firction   (Dimensioness)

Fn   =   Normal force between surfaces   (N)


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Equation Assumptions


  • There is no lubrication or fluid between surfaces.
  • Constant surfaces are rigid.
  • The coefficient of friction remains constant.
  • Normal force is perpendicular.
  • There is no significant wear or surface changes.