Исходники иллюстрации

\documentclass[tikz]{standalone}\input{pre.tex}\begin{document}\begin{tikzpicture}
    \draw[interface, draw] (-2,-0.5) rectangle ++ (4,0.5);
    \draw (-0.5,0) rectangle ++ (1,2);
    \draw[->] (0,0) -- (0,1.5);
    \foreach \i in {80,84,...,100}{
        \draw (0,0) ++ (\i:1.6) -- ++ (\i:0.1);
    }

    \draw (2.8,0.6) circle (0.6);
    \draw (2.8,0.6) circle (0.3);

    \draw (3.1,0.6) coordinate (b) -- ++(0,-1.5) coordinate (1);

    \fill[gray, draw=none] (1) rectangle ++ (-0.25,-0.5);
    \fill[gray, draw=none] (1) rectangle ++ (0.25,-0.5);

    \draw (-1.25,0) -- ++ (0,0.5);
    \draw[fill=white] (-1.8,0.5) rectangle ++ (1.1,0.2);
    \draw[fill=gray] (-1.4,0.7) rectangle ++ (0.5,0.7);
    \draw (1.25,0) -- ++ (0,0.5);
    \draw[fill=gray] (1.4,0.7) rectangle ++ (-0.5,0.5); 
    \draw[fill=white] (2.8,0.5) rectangle ++ (-2.1,0.2);    
    % \draw[line width=5pt, black!30] (0,0) -- (0,-1);

    % \draw[thick] (0,-1) circle (2pt) node[left, xshift=-0.5em] {$O$} -- ++ (-60:4);

    \draw[axis,->] (4,2) -- ++ (0,-2) node[below] {$+x$};   

    % \draw[line width=5pt] (0,-1) ++ (-60:1.9) coordinate (1) ++ (-60:-0.1) -- ++ (-60:0.2);   
    % \draw[axis,->] (0,-1) -- ++ (-90:4) node[below] {$+z$};

    % \draw[axis,->] (0,-1)++(-60:4) -- ++ (30:2) node[right] {$+\tau$};

    \draw[force,->] (1) -- ++(0,0.4) node [right] {$\vec{T}$};
    \draw[force,->] (b) -- ++(0,-0.4) node [right] {$\vec{T}'$};
    \draw[force,->] (1)++(0,-0.5) -- ++(0,-0.4) node [right] {$m\vec{g}$};

    % \draw[inforce,->] (1) -- ++(1,0) node [right] {$d\vec{F}_{in}$};
    % \draw[force,->] (1) -- ++(0,-1) node [below] {$dm\vec{g}$};



% \draw[line width=5pt] (0,-1) ++ (-60:1.9) coordinate (1) ++ (-60:-0.1) -- ++ (-60:0.2);       

\end{tikzpicture}\end{document}