Friction
Let, a block is projected with initial velocity v along a surface of ground. The block will finally come to rest. This means while the block is moving it experiences an opposing force that points in a direction opposite to its motion. This opposing force is named the force of friction. Hence, "Friction is an opposing force which is developed between the surfaces in contact when a body actually moves or tends to maneuver over the surface of another body.
When the surface of one body slides over that of another, then each body exerts a frictional force on the other. The frictional force acting on each body is in a direction opposite to its motion relative to the other body. The frictional forces exist between surfaces even when no relative motion is actually present but there is only a tendency for the relative motion.
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