Исходники иллюстрации

\documentclass[tikz]{standalone}\input{pre.tex}\begin{document}\begin{tikzpicture}
    \begin{scope}[scale=1]
        \draw (0.5,0) circle (0.28);
        \draw (2.5,0) circle (0.28);
        \draw[fill=white] (0,0) rectangle (3,0.3);
        \draw[line width=2pt] (2.5,0.3) -- ++(0,2) -- ++(-1,0) ++(0,1pt) coordinate (o);

        \draw[fill=black] (o) -- ++(-90:1.5cm) coordinate (b) circle (2pt); 

        \draw[axis] (o) -- ++ (0,-3);

        \draw[interface] (-1,-0.3) rectangle ++(5,-0.3);
        \draw[thick] (-1,-0.3) -- ++(5,0);

        \draw[force,->] (b) -- ++(0,-1) node[below, yshift=-1.2em] {$m\vec{g}$};
        \draw[force,->] (b) -- ++(0,1) node[left] {$\vec{T}$};
        \draw[acceleration,->] (-1,2.25) -- node[left] {$\vec{g}$} ++(0,-1);

    \end{scope}
    
\end{tikzpicture}\end{document}