Friction

Friction is a force that opposes the relative motion or tendency of motion between two surfaces in contact. It occurs due to the microscopic irregularities present on the surfaces, which interlock or deform when they come in contact. Friction can be classified into two types: static friction and kinetic friction.

Static friction is the resistance force that keeps two objects at rest from sliding past each other. It varies in magnitude depending on the applied force or tendency to move, but it always acts in the direction opposite to the applied force. Once the applied force overcomes the static friction, the objects start moving, and kinetic friction comes into play.

Kinetic friction, also known as sliding friction, arises when two surfaces are in relative motion. It acts to oppose the motion and is generally less than or equal to the static friction. The magnitude of kinetic friction depends on the nature of the surfaces and the normal force between them.

Friction plays a crucial role in our daily lives. It allows us to walk, drive vehicles, hold objects, and perform various tasks. At the same time, friction also produces heat, leading to energy loss, wear and tear of materials, and the need for lubrication to reduce its effects.