\begin{definition}[Definition:Pendulum/Ideals]
The ideals of a pendulum are as follows:
:The rod is of zero thickness, infinite stiffness and zero mass.
:The pivot is immovable and  has zero friction.
:The bob is of zero volume.
:The gravitation field is (usually) taken to be constant and uniform.
:The medium in which the pendulum moves offers no resistive force, unless otherwise specifically stated.
Category:Definitions/Pendulums
\end{definition}