Example: Distance, velocity and acceleration vectors

Published 2010-01-31 | Author: Jason Waskiewicz

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% Distance, velocity and acceleration vectors
\documentclass{article}
\usepackage[utf8]{inputenc}
\usepackage{tikz}
\begin{document}
\begin{tikzpicture}[scale=2,>=stealth]

\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} 