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.
Representative curves showing: (a) normal force against normal displacement up to 1 N along with Hertzian fitting; (b) frictional force against displacement for materials tested at 1 N of normal force; and (c) frictional force against displacement for CDG at 1 and 2 N of normal force.
