Static and Kinetic Friction

  • The frictional force between two stationary surfaces is called the static friction,  fs.
  • The frictional force between two sliding surfaces is called the kinetic friction, fk.

statickinetic.gif

  • It can be shown empirically that between two particular surfaces
    • static friction fs ranges from zero to a maximum value.

0 < fs < μsN

    • kinetic friction fk is constant and independent of speed.

fk = μkN 

    • maximum static friction is larger than kinetic friction.
  • Even though there are exceptions, friction (both static and kinetic) is usually not dependent on the area of contact.

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