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A lower friction coefficient indicates a lower resistance to the sliding motion - measurements are usually made material surface against itself, as CoF values can vary with surface finishes and contamination on test surfaces.
There are two components of friction, static and dynamic. Static friction is the force required to initiate movement between the two surfaces, whereas dynamic friction (often called kinetic friction) is the force required to maintain motion between the surfaces.
The coefficient of friction, or the slip, is a critical property of all materials which run on high speed printing and packaging lines such as photocopier papers and cartons.