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% create tikz drawing of a simple mass spring system
\tikzstyle{hmline}=[{Latex[length=3.3,width=2.2]}-{Latex[length=3.3,width=2.2]},line width=0.3]
\tikzstyle{vmline}=[red, dashed,line width=0.4,dash pattern=on 1pt off 1pt]
\tikzstyle{ground}=[pattern=north east lines]
\tikzstyle{mass}=[line width=0.6,red!30!black,fill=red!40!black!10,rounded corners=1,top color=red!40!black!20,bottom color=red!40!black!10,shading angle=20]
\tikzstyle{spring}=[line width=0.8,blue!7!black!80,snake=coil,segment amplitude=5,line cap=round]
\begin{tikzpicture}[scale=2,>=latex]
\newcommand{\ticks}[2]
{
% arguments: x, y coordinates
\draw[thick] (#1, #2 - 0.1 / 2) --++ (0, 0.1);
}
\tikzmath{
\hWall = 1.2;
\wWall = 0.3;
\lWall = 3.5;
\hMass = 0.6;
\wMass = 1.1;
\xMass1 = 1.2;
\xMass2 = 2.2;
\xAxisYpos = 0;
\originX1 = 0;
\originY1 = 0.5;
\originX2 = 0;
\originY2 = -2;
\springscale=7;
}
% create x axis
\draw[->,thick] (0,\xAxisYpos) --+ (\lWall, 0) node[right]{$x$};
% create ticks on x axis
\ticks{\wWall}{\xAxisYpos}
\ticks{\xMass1}{\xAxisYpos}
\ticks{\xMass2}{\xAxisYpos}
% create underground
\draw[ground] (\originX1, \originY1) ++ (0, 0) --+(\lWall,0) --+(\lWall, \wWall) --+(\wWall, \wWall) --+(\wWall, \hWall) --+(0, \hWall) -- cycle;
\draw[ground] (\originX2, \originY2) ++ (0, 0) --+(\lWall,0) --+(\lWall, \wWall) --+(\wWall, \wWall) --+(\wWall, \hWall) --+(0, \hWall) -- cycle;
% create masses
\draw[mass] (\originX1, \originY1) ++ (\xMass1, \wWall) rectangle ++ (\wMass,\hMass) node[midway] {$m$};
\draw[mass] (\originX2, \originY2) ++ (\xMass2, \wWall) rectangle ++ (\wMass,\hMass) node[midway] {$m$};
% create springs
\draw[spring, segment length=(\xMass1 - \wWall) * \springscale] (\originX1, \originY1) ++
(\wWall, \wWall + \hMass / 2) --++ (\xMass1 - \wWall, 0) node[midway,above=3.5] {$k$};
\draw[spring, segment length=(\xMass2 - \wWall) * \springscale] (\originX2, \originY2) ++
(\wWall, \wWall + \hMass / 2) --++ (\xMass2 - \wWall, 0) node[midway,above=3.5] {$k$};
% create vertical measurement line
\draw[vmline] (\xMass1, \xAxisYpos) --+(0, \originY1 + \wWall);
\draw[vmline] (\xMass2, \xAxisYpos) --+(0, \originY2 + \hMass+\wWall);
\draw[vmline] (\wWall, \originY1+\wWall) --(\wWall, \originY2 + \hWall);
% create horizontal measurement line
\draw[hmline] (\wWall, \xAxisYpos + 0.2) -- (\xMass1, \xAxisYpos + 0.2) node[midway,fill=white,inner sep=0] {$l_0$};
\draw[hmline] (\xMass1, \xAxisYpos + 0.2) -- (\xMass2, \xAxisYpos + 0.2) node[midway,fill=white,inner sep=0] {$\Delta_{x}$};
\draw[hmline] (\wWall, \xAxisYpos - 0.3) -- (\xMass2, \xAxisYpos - 0.3) node[midway,fill=white,inner sep=0] {$l_{1}$};
% create force arrow
\draw[->,blue, very thick,line cap=round] (\xMass2 + \wMass / 2, \originY2 + \wWall + \hMass + 0.15) node[above] {$\vb{F_{R}}$} --+ (-0.5, 0);
\end{tikzpicture}
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