3. Terminology
3.1 Definitions:
3.1.1 friction, n—resistance to relative motion between two
bodies in contact.
3.1.1.1 coeffıcient of friction—the ratio of the force required
to move one surface over another to the total force applied
normal to those surfaces.
3.1.1.2 kinetic coeffıcient of friction—the ratio of the force
required to move one surface over another to the total force
applied normal to those surfaces, once that motion is in
progress.
3.1.1.3 static coeffıcient of friction—the ratio of the force
required to move one surface over another to the total force
applied normal to those surfaces, at the instant motion starts.
3.2 Definitions of Terms Specific to This Standard:
3.2.1 slip—in plastic films, lubricity of two surfaces sliding
in contact with each other.