SCOF- Static: Measures the amount of force required to initiate movement or cause slipping when a person is standing still on a surface. It is important to note that standards for measuring SCOF have all been withdrawn.

DCOF- Dynamic: The dynamic (or kinetic) coefficient of friction (DCOF) is the measure of the resistance to motion between two surfaces that are already in motion relative to each other. In practical terms, it refers to the amount of force needed to keep an object sliding or moving over a surface once it has already started moving. For instance, when considering a person walking, it’s the level of resistance they feel underfoot while in motion, impacting their ability to walk without slipping.