An Atomic Force Microscope Consists of a Cantilever with a Very

Multiple Choice

An atomic force microscope consists of a cantilever with a very fine tip on one end. The lever is driven by a piezoelectric motor allowing the tip to scan a surface on an atomic scale. As it scans the surface, what is the main frictional force between the tip and the surface?

A) static
B) kinetic
C) rolling
D) all three
E) There is no frictional force.