
Edit and compile if you like:
% Distance, velocity and acceleration vectors% Author: Jason Waskiewicz\documentclass{article}\usepackage[utf8]{inputenc}\usepackage{tikz}\usepackage[active,tightpage]{preview}\PreviewEnvironment{tikzpicture}\setlength\PreviewBorder{5pt}%\begin{document}\begin{tikzpicture}[scale=2,>=stealth]%Draw Circle radius 1 cm\draw (0,0) circle (1cm);%The foreach command counts the angle of the distance vectors and which distance vector\foreach \angle/\count in {20/1,140/2,260/3}{%Draws the 3 distance vectors\draw [name=distance vectors,very thick,->] (0,0) -- node[near start,fill=white] {$\vec{r}_{\count}$} (\angle:1cm);%Draws the 3 velocity vectors at right angles to the distance vectors\draw [name=velocity vectors,rotate around={90:(\angle:1cm)},very thick,->](\angle:1cm) -- node[fill=white] {$\vec{v}_{\count}$} (\angle:1.6cm) ;%Draws the 3 acceleration vectors directed inward and offset slightly from the distance vectors\draw [name=acceleration vectors,very thick,->](\angle+5:1cm) -- node[fill=white] {$\vec{a}_{\count}$} (\angle+15:0.3cm) ;}\end{tikzpicture}\end{document}
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