Mechanical Equivalent of a Capacitor is a Spring
The mechanical analog of a capacitor is the compliance of a
spring. The voltage 
across a capacitor 
corresponds to the
force 
used to displace a spring. The charge 
stored in
the capacitor corresponds to the displacement 
of the spring.
Thus, Eq.
(E.2) corresponds to Hooke's law for ideal springs:
is called the spring constant or
spring stiffness.
Note that Hooke's law is usually written as
. The quantity 
is called the
spring compliance.
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Properties of Paraunitary Filter Banks
