Sliding friction is also known as kinetic friction. When extra force exceeds the limiting friction, the body begins to change its moment on the surface. Then the force of friction is called the kinetic friction.
When an external force is used to start relative motion, the interlocking of surfaces gets teared off, thus causing less frictional force. That is why once the motion starts, the frictional force acting between the surfaces in contact decreases, so that a smaller force is required to maintain uniform motion. That is why static friction is more than kinetic friction. Kinetic friction is constant whatever the velocity of body may be & is always less than the limiting friction.
In our next blog we shall learn about langmuir isotherm I hope the above explanation was useful.Keep reading and leave your comments.
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