Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Comparison of the coefficient of friction (COF) of the 18 frictional surfaces measured using the mass and pulley method and by computation of the slip ratio using bare hands and Tegaderm. Error bars represent between-subject variability for the slip ratio.
