Physical pendulum

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% Author: Urs Zellweger (urs@zellweger.li)
\documentclass[11pt]{article}
\usepackage{tikz}
\usepackage[active,tightpage]{preview}
\PreviewEnvironment{tikzpicture}
\setlength\PreviewBorder{5pt}%
\usepackage{pgf}
\usepackage{pgffor}
\usepgfmodule{shapes}
\usepgfmodule{plot}
\usetikzlibrary{decorations}
\usetikzlibrary{arrows}
\usetikzlibrary{snakes}
\newcommand{\physicalpendulum}{
    \pgfpathmoveto{\pgfpoint{0cm}{2cm}}
    \pgfpathcurveto{\pgfpoint{.2cm}{2cm}}{\pgfpoint{.2cm}{2cm}}{\pgfpoint{1cm}{1cm}}
    \pgfpathcurveto{\pgfpoint{1.75cm}{0cm}}{\pgfpoint{1.8cm}{0cm}}{\pgfpoint{2cm}{-2cm}}
    \pgfpathcurveto{\pgfpoint{2.2cm}{-4cm}}{\pgfpoint{2.3cm}{-4.2cm}}{\pgfpoint{2.5cm}{-5cm}}
    \pgfpathcurveto{\pgfpoint{2.7cm}{-5.8cm}}{\pgfpoint{3cm}{-6cm}}{\pgfpoint{3cm}{-7cm}}
    \pgfpathcurveto{\pgfpoint{3cm}{-8cm}}{\pgfpoint{2.25cm}{-8.75cm}}{\pgfpoint{2cm}{-9cm}}
    \pgfpathcurveto{\pgfpoint{1.75cm}{-9.25cm}}{\pgfpoint{1cm}{-10cm}}{\pgfpoint{0cm}{-10cm}}
    \pgfpathcurveto{\pgfpoint{-2cm}{-10cm}}{\pgfpoint{-3cm}{-8cm}}{\pgfpoint{-3cm}{-7cm}}
    \pgfpathcurveto{\pgfpoint{-3cm}{-3cm}}{\pgfpoint{-1cm}{-2cm}}{\pgfpoint{-1cm}{-1cm}}
    \pgfpathcurveto{\pgfpoint{-1cm}{0cm}}{\pgfpoint{-.5cm}{2cm}}{\pgfpoint{0cm}{2cm}}
    \pgfusepath{fill,stroke}
}
\begin{document}
\begin{center}
\begin{tikzpicture}[scale=.48]
    \color{black!20!white}
    \physicalpendulum
    \draw[color=red, dashed] (0,3)--(0,-11);
 
 
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