\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 (0,2) coordinate (o) circle (2);
\draw (o) circle (0.5);
\draw[interface] (-4,-0.25) rectangle (4,0);
\draw[thick] (-4,0) --(4,0);
\draw (0,1.5) -- ++(3,0);
\draw[force,->] (0,1.5) ++(3,0) -- ++ (1,0)
node[right] {$\vec{u}$};
\draw (o) -- ++ (45:0.5)
node[right, yshift=3pt] {$r$};
\draw (o) -- node[left, xshift=-2pt] {$R$} ++ (135:2);
\draw[fill] (0,4) coordinate (A) circle (2pt) node[above] {$A$};
\draw[fill] (0,0) coordinate (0) circle (2pt) node[below, yshift=-6pt] {МЦС};
\draw[force,->] (o) -- ++(1,0)
node[right] {$\vec{v}_0$};
\draw[force,->] (A) -- ++(2,0)
node[right] {$\vec{v}_A$};
\draw[axis] (0,0) -- (2,4);
\end{tikzpicture}\end{document}
