elem-mass_inclined_plane.tex

% https://tex.stackexchange.com/a/13405/173708
\documentclass[border=15pt]{standalone}
\usepackage{tikz}
\usetikzlibrary{calc}

\begin{document}

\begin{tikzpicture}[every node/.style={draw}]

    \begin{scope}[rotate=-30]
        \node at (3,0) [draw,name=A,rectangle, minimum width=2cm,minimum height=1cm,anchor=south,label=$m_1$,transform shape] {};
        \node at (6,0) [name=B,rectangle, minimum width=1cm,minimum height=0.75cm,anchor=south,label=$m_2$,transform shape] {};
        \node at (0,0) [name=C,circle,minimum size=.8cm,transform shape] {}; % pulley

        \draw (C.north) -- ($(A.south west)!(C.north)!(A.north west)$);
        \draw ($(A.south east)!(C.north)!(A.north east)$) -- ($(B.south west)!(C.north)!(B.north west)$);
        \draw(1,0) -- (8,0);
    \end{scope}
    % draw the vertical part
    \node at (-0.4,-5) [draw,name=D,rectangle, minimum width=1cm,minimum height=2cm,anchor=south,label=right:$m_3$] {};
    \draw ($(D.north west)!(C.210)!(D.north east)$) -- (C.210)  arc [start angle=180,end angle=60,radius=0.4cm];
\end{tikzpicture}
\end{document}