Wiktionary
n. (context physics English) The ratio between (1) the magnitude of the force of friction which a surface produces on an object (moving along the surface or being pressed statically against it) and (2) the magnitude of the normal force which is produced by the surface on the object and which is perpendicular to that surface.
WordNet
n. the ratio of the weight of an object being moved along a surface and the force that maintains contact between the object and the surface
Usage examples of "coefficient of friction".
Increased heat reduced the coefficient of friction of the climbing rope and under the conditions gravity began to assert its natural hold.
Under her breath she said the word that temporarily reduced the coefficient of friction in that spot, then stood on her hind legs and leaned against the door.
And the extremely low coefficient of friction of the single-molecule structure would improve the performance of almost any machinery, since nearly all of it had moving parts.
The speed of their flight would vary depending on the efficiency of each particular spring release and the coefficient of friction on the floor rails.
If you measured the temperature rise, he reasoned, you could probably get some kind of estimate of the hull's coefficient of friction.
He had merely taken the opportunity to test the efficacy of the 3 water so that he could estimate the coefficient of friction be fore and after.
Since nobody except themselves was there to see, Jacob Wasserman erected a psychocreative umbrella above them all and adjusted the ice's coefficient of friction.
She first did a small wizardry which would release the catch of the microwave oven and push the door back: then, while that was working, she spoke to the coefficient of friction at the end of the pizza box where the glue was, then levitated the box up on its side and shook.