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What is the formula for the laws of static friction?

Posted in FRICTION IN SOLIDS AND LIQUIDS | Email This Post Email This Post |

The laws of static friction are,

  • When two surfaces are in contact , the frictional force is always tangential to contacting surfaces in a direction opposite to that in which the body tends to move.
  • The limiting force of static friction is directly proportional to normal reaction between two surfaces in contact.
  • The force of static friction depends on nature and materials of surface.
  • The coefficient of static friction is independent of the area and shape of the contacting surfaces.

The formula for law of static friction is given as,

  FS = µs N      ——— where FS=Force of static friction, µs= coefficient of static friction and N=Normal force

The formula for coefficient of static friction is given as,

µs = FS / N 


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