File:Giroszkóp2.png

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\documentclass{article}
\usepackage{pst-node}

% args: 1 - horiz rad, 2 - vert rad, 3 - horiz shift
\newcommand{\cylinder}[3]{%
  \psellipse(#3,0)(#1,#2)%
  \pscustom{%
    \psline(#3,-#2)(0,-#2)%
    \psline(0,#2)(#3,#2)}%
  \psellipse(#1,#2)}

\begin{document}
\begin{pspicture}(-5,-5)(5,5)\SpecialCoor\Large

{\psset{fillstyle=solid,fillcolor=gray}\rput{-90}{

    \cylinder{.05}{.1}{2.35}

    %% The rotor
    \put(-.2,0){\cylinder{1}{2}{.4}
      {\psset{unit=.8\psunit}
        \begin{psclip}{\psellipse[fillcolor=lightgrey](1,2)}
          \psellipse(.15,0)(1,2)
        \end{psclip}
        \psellipse[fillstyle=none](1,2)}
      {\psset{unit=.2\psunit}
        {\psset{fillcolor=lightgrey}\cylinder{1}{2}{.6}}
        \psellipse(1,2)}}

    \put(-2.4,0){\cylinder{.05}{.1}{2.2}}}}

%% Axel lines
\psline[linestyle=dashed](0,2.4)(0,3)
\psline[linestyle=dashed](0,-2.4)(0,-3.4)

\psline[linestyle=dashed](2,0)(3,0)
\psline[linestyle=dashed](-2,0)(-3,0)

\psline[linestyle=dashed](1.3;60)(2.3;60)
\psline[linestyle=dashed](1.3;240)(2.3;240)

%% Vectors
\pcline[linewidth=3\pslinewidth]{->}(0,3)(0,4)
\Bput{$\mathbf{L}$}

\psline[linestyle=dashed](0,2.4)(-.5,2.4)
\pcline[linewidth=3\pslinewidth]{->}(-.5,2.4)(-1.5,2.4)
\Aput{$\mathbf{F}$}

\pcline[linewidth=3\pslinewidth]{->}(2.3;240)(3;240)
\Bput{$\mathbf{\tau} = \frac{d\mathbf{L}}{dt}$}

\put(0,4){
  \pcline{->}(.1;240)(.6;240)
  \Bput{$\Delta\mathbf{L}$}}

\end{pspicture}
\end{document}