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Pick up the wrong statement about friction force for dry surfaces. Friction force is

The law of static friction states that the force of friction, that resists the motion of the body as it starts to fall down the surface, is proportional to the normal (perpendicular) force that the body exerts on the surface.

Following are the laws of static friction

  1. The force of friction is directly proportional to the normal load between the surfaces.
  2. The force of friction is independent of the area of the contact surface for a given normal load.
  3. The force of friction depends upon the material of which the contact surfaces are made.
  4. The force of friction is independent of the velocity of sliding of one body relative to the other body.