The increase in static friction which occurs with time of stationary contact of a seal.

A phenomenon caused by the surface tension of liquids. The liquid in between two solid surfaces tends to retain the smallest surface area and pulls these solid surfaces together. This effect is noticeable for very smooth surfaces only. The generated forces could be extremely high and, in the case of magnetic hard disk drive, could prevent a disk from rotating when the slider sticks to a very smooth disk surface.

Friction encountered when accelerating an object from a stationary position. Static friction is always greater than moving friction, and limits the smallest possible increment of movement.