2010/example.tex

   1 % Distance, velocity and acceleration vectors
   2 % Author: Jason Waskiewicz
   3 \documentclass{article}
   4 \usepackage[utf8]{inputenc}
   5 \usepackage{tikz}
   6 %%%<
   7 \usepackage{verbatim}
   8 \usepackage[active,tightpage]{preview}
   9 \PreviewEnvironment{tikzpicture}
  10 \setlength\PreviewBorder{5pt}%
  11 %%%>
  12
  13 \begin{comment}
  14 :Title: Distance, velocity and acceleration vectors
  15 :Slug: dva-vectors
  16
  17 \end{comment}
  18
  19 \begin{document}
  20 \begin{tikzpicture}[scale=2,>=stealth]
  21
  22 %Draw Circle radius 1 cm
  23     \draw (0,0) circle (1cm);
  24
  25 %The foreach command counts the angle of the distance vectors and which distance vector
  26     \foreach \angle/\count in {20/1,140/2,260/3}
  27         {
  28
  29 %Draws the 3 distance vectors
  30         \draw [name=distance vectors,very thick,->] (
  31             0,0) -- node[near start,fill=white] {$\vec{r}_{\count}$} (\angle:1cm);
  32
  33 %Draws the 3 velocity vectors at right angles to the distance vectors
  34         \draw [name=velocity vectors,rotate around={90:(\angle:1cm)},very thick,->]
  35             (\angle:1cm) -- node[fill=white] {$\vec{v}_{\count}$} (\angle:1.6cm) ;
  36
  37 %Draws the 3 acceleration vectors directed inward and offset slightly from the distance vectors
  38         \draw [name=acceleration vectors,very thick,->]
  39             (\angle+5:1cm) -- node[fill=white] {$\vec{a}_{\count}$} (\angle+15:0.3cm) ;
  40     }
  41
  42 \end{tikzpicture}
  43 \end{document}