If we slide or try to slide a BODY over a surface the motion is resisted by a bonding between the body and the surface. The resistance is represented by a single force and is called friction.¤¤ The force of friction is parallel to the surface and opposite to the directions of intended motion.☆☆ ☆☆¤¤ The OPPOSING force that comes into play when objects are at rest.▪ It the case of static friction F = P ▪ Static friction is a self-adjusting force because it changes itself in accordance with the applied force.¤¤ The maximum value of static friction upto which body does not move is called limiting friction.▪ The magnitude of limiting friction between any two bodies in CONTACT is DIRECTLY proportional to the normal reaction between them.▪ Direction of the friction of limiting friction is always opposite to the direction in which one body is at the verge of moving.¤¤ If the applied force sets the body in motion, the friction opposing the motion is called kinetic friction. ▪ Kinetic friction depends upon the normal reaction friction. ▪ Kinetic friction is always lesser than limiting friction.