Limiting Friction:- The maximum value of frictional force, which comes into play, when a body just begins to slide over the surface of the other body, is known as limiting friction.

Law of limiting friction for dry surfaces:

• When two bodies are in contact, the direction of the force of friction on one of them is opposite to the direction in which this body has the tendency to move.
• The frictional force is independent of the area of contact of the surfaces.
• When one body is just on the point of sliding over the other body, the maximum force of friction is being exerted, This is called limiting friction.
• The force of friction is dependent upon the type of materials of the two bodies in contact.
• The limiting frictional force is proportional to the normal force that acts between the bodies in contact.
• The ratio of frictional force to the normal reaction is constant and is known as the coefficient of friction i.e. μ = F/N
• Limiting static friction is somewhat greater than the kinetic friction
• The kinetic friction is independent of the relative velocity of the bodies in contact