Solid friction or dry friction is generally known as coulomb friction. In this context you have to remember that there should not be any lubricants or similar things used for those contacting surface to behave differently.

Features and laws of Coulomb friction:

  • Frictional force will always try to place a counter force against solid mass and prevent movements.
  • It will work in opposite direction of the movements of surface.
  • The force to pull a mass in a surface at rest will be of equal amount as frictional force.
  • You will find frictional force at its maximum power when the surface will be in the verge of sliding or movement.
  • The maximized frictional force is called limiting frictional force.
  • There is a ratio between this limiting frictional force and normal reaction which will be placed upon two surfaces.
  • The two or more surfaces will not have any influence on limiting frictional force.

The coefficient of static frictional force is always more than coefficient of kinetic frictional force.

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