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\documentclass[a4paper]{article}
\usepackage{pstricks}
\usepackage{pst-node}
\usepackage{pst-coil}
\pagestyle{empty}
\begin{document}
\SpecialCoor
\begin{pspicture}(-2,-2)(2,2)
\pscircle{2}
\pnode(2;-90){O}
\pnode(2;10){A}\pnode(2;60){B}
\pnode(2;190){C}\pnode(2;-60){D}
\qdisk(A){3pt}\qdisk(B){3pt}
\qdisk(C){3pt}\qdisk(D){3pt}
\nccoil[coilarm=3mm,coilwidth=3mm,linecolor=red]{-}{O}{A}%
\nccoil[coilarm=3mm,coilwidth=3mm,coilheight=1.4,linecolor=red]{-}{O}{B}%
\nccoil[coilarm=3mm,coilwidth=3mm,coilheight=.9,linecolor=red]{-}{O}{C}%
\nccoil[coilarm=3mm,coilwidth=3mm,coilheight=.5,linecolor=red]{-}{O}{D}%
\rput(1.6,-.4){$m$}
\rput(.8,-1){$k$}
\psline[linecolor=blue,linewidth=1.5pt]{<-}(-2,0)(0,0)
\rput(-1,.2){$r$}
\end{pspicture}
\end{document}
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