Definition of coefficient of friction in US English:

coefficient of friction


  • The ratio between the force necessary to move one surface horizontally over another and the pressure between the two surfaces.

    • ‘The coefficient of friction and other aerodynamic aspects in aircraft are more important than simply miles per gallon.’
    • ‘Nylon gears and other moving parts have low coefficients of friction and excellent wear-resistance and impact and tensile strengths.’
    • ‘In fact, the thickness of the oil determines its coefficient of friction and defines four distinct regions of lubrication.’
    • ‘Such mills have large diameter rolls with surfaces that are roughened or ragged to increase the coefficient of friction.’
    • ‘It appears that this more subtle effect accounts for the low coefficient of friction of icy surfaces.’