en.wikipedia.org/wiki/Friction

The coefficient of friction (COF), often symbolized by the Greek ... Rougher
surfaces tend to have higher effective values.

www.engineeringtoolbox.com/friction-coefficients-d_778.html

It is commonly thought that the static coefficients of friction are higher than the
dynamic or kinetic values. This is a very simplistic statement and quite misleading
...

www.physlink.com/reference/frictioncoefficients.cfm

Coefficients of friction of various materials. ... Materials, Coeff. of Static Friction
Greek letter mu s, Coeff. of Kinetic Friction Greek letter mu k ...

www.roymech.co.uk/Useful_Tables/Tribology/co_of_frict.htm

Jan 17, 2013 ... A table below shows approximate friction coefficients for various materials. All
values are approximate and are only suitable for guidance only.

www.carbidedepot.com/formulas-frictioncoefficient.htm

Materials and Material Combinations, Coefficient of Friction. Clean, Lubricated.
Steel, 0.74, 0.16. Copper-lead alloy, 0.22, -. Phosphor-bronze, 0.35, -. Aluminum-
...

blog.mechguru.com/machine-design/typical-coefficient-of-friction-values-for-common-materials/

Sep 2, 2011 ... The static and kinetic friction coefficient values reference table shown in this
article will be helpful for finding the COF values of commonly used ...

hypertextbook.com/facts/2005/steel.shtml

Friction is a resistive force that prevents two objects from sliding freely agaisnt
each other. The coefficient of friction (µ) is a number that is the ratio of the
resistive ...

engineering.nyu.edu/gk12/Information/Vault_of_Labs/Physics_Labs/static and kinetic friction.doc

Table 1[1, 2] has typical values of static and kinetic friction for different material
combinations. Note that the static coefficient of friction is higher than the kinetic ...

www.amesweb.info/Screws/Tables/FrictionCoefficientsPowerLeadScrews.aspx

COEFFICIENT OF FRICTION TABLE FOR LEAD SCREWS (POWER SCREWS).
Typical friction coefficients of thread and collar in lead screws are given in the ...

physics.tutorvista.com/forces/friction-coefficient.html

Coefficient of Friction Table. Material 1, Material 2, Coefficient Of Friction. Dry,
Greasy. Static, Sliding, Static, Sliding.