\documentclass[tikz]{standalone}\input{pre.tex}\begin{document}\begin{tikzpicture}[
force/.style={>=latex,draw=blue,fill=blue},
% axis/.style={densely dashed,gray,font=\small},
axis/.style={densely dashed,black!60,font=\small},
M/.style={rectangle,draw,fill=lightgray,minimum size=0.5cm,thin},
m2/.style={draw=black!30, rectangle,draw,thin, fill=blue!2, minimum width=0.7cm,minimum height=0.7cm},
m1/.style={draw=black!30, rectangle,draw,thin, fill=blue!2, minimum width=0.7cm,minimum height=0.7cm},
plane/.style={draw=black!30, very thick, fill=blue!5, line width=1pt},
% base/.style={draw=black!70, very thick, fill=blue!4, line width=2pt},
string/.style={draw=black, thick},
pulley/.style={thick},
interface1/.style={draw=gray!60,
% The border decoration is a path replacing decorator.
% For the interface style we want to draw the original path.
% The postaction option is therefore used to ensure that the
% border decoration is drawn *after* the original path.
postaction={draw=gray!60,decorate,decoration={border,angle=-135,
amplitude=0.3cm,segment length=2mm}}},
interface/.style={
pattern = north east lines,
draw = none,
pattern color=gray!60,
},
plank/.style={
fill=black!60,
draw=black,
minimum width=3cm,
inner ysep=0.1cm,
outer sep=0pt,
yshift=0.75cm,
pattern = north east lines,
pattern color=gray!60,
},
cargo/.style={
rectangle,
fill=black!70,
inner sep=2.5mm,
}
]
% \draw[force,double equal sign distance=2pt,->] (c) -- ++(0,-2) node[below] {$\vec{a}_0$};
\matrix[column sep=0cm, row sep=0cm] {
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\draw[thick, interface1] (-1,0) -- (8,0);
\draw[thick,] (5,0) arc (-90:90:1.5cm);
\draw[thick] (0,3) coordinate (a) .. controls (2,3) and (3,0) .. (5,0);
\draw[axis,<->] (0,0) -- node[left] {$h$} (a);
\draw[axis,<->] (7,0) -- node[right] {$\frac{h}{2}$} ++(0,1.5);
\draw[axis] (0,1.5) -- (7,1.5);
\draw[axis,fill] (5,1.5) -- ++(41:1.5) coordinate (m) circle(3pt);
\draw[axis] (5,1.5) -- ++(41:1.5);
\path[draw,->] (5,1.5) ++ (0.7,0) arc(0:41:0.7);
\path[] (5,1.5) -- ++ (30:0.5) node[right, xshift=5pt, scale=1] {$\phi$};
\draw[force,->] (m) -- ++(41:0.7) node[below] {$\vec{P}$};
\draw[force,->] (m) -- ++(41:-0.7) node[above, yshift=5pt] {$\vec{N}$};
\draw[force,->] (m) -- ++(90:-1.4) node[below, xshift=-5pt] {$m\vec{g}$};
\\
};
\end{tikzpicture}\end{document}
