物理っぽいの

\documentclass[b5j,10pt,twoside]{tetsujsarticle}
\usepackage{tetsuryoku}
\begin{document}

\begin{tikzpicture}[>=stealth]
\draw[->] (-3,0) -- (3,0) node[right]{$x$};
\draw[->] (0,-3) -- (0,3) node[above]{$y$};
\draw(0,0) circle (2);
\foreach \t in {0,30,...,330}{
  \node[circle,shade] (a) at (\t:2) {};
  \draw[->,line width=1pt,color=red] (0,0) -- (a);
  \draw[->,line width=1pt,color=blue](a) -- +(\t+90:1);
  \node[color=red] at (\t-10:1.6) {$x$};
  \node[color=blue] at ($(\t:2) + (\t+90:0.5) + (\t:0.2)$) {$v$};
}
\end{tikzpicture}

\begin{tikzpicture}[>=stealth]
\draw[->] (-3,0,0) -- (3,0,0) node[right]{$x$};
\draw[->] (0,-3,0) -- (0,3,0) node[above]{$y$};
\draw[->] (0,0,-10) -- (0,0,10) node[above]{$z$};
\foreach \t in {-100,-99,...,100}{
  \fill ({cos(10*\t)},{sin(10*\t)},\t/10) circle (1pt);
}
\end{tikzpicture}

\end{document}