Millstone

Physics of a rotating millstone: forces, torques, and angular momentum. The normal force F_N is larger when the runner store is rolling around. Inspiration from Physics LibreTexts.

Edit and compile if you like:

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% Author: Izaak Neutelings (August 2021)
\documentclass[border=3pt,tikz]{standalone}
\usepackage{physics}
\usepackage{tikz}
\usepackage[outline]{contour} % glow around text
\usetikzlibrary{calc}
\usetikzlibrary{angles,quotes} % for pic
\usetikzlibrary{arrows.meta}
\usetikzlibrary{bending}
\usetikzlibrary{patterns}
\tikzset{>=latex} % for LaTeX arrow head
\contourlength{1pt}
\colorlet{xcol}{blue!70!black}
\colorlet{vcol}{green!60!black}
\colorlet{acol}{red!50!blue!80!black!80}
\colorlet{myred}{red!65!black}
\colorlet{mypurple}{blue!60!red!80}
\tikzstyle{rvec}=[->,xcol,very thick,line cap=round]
\tikzstyle{vvec}=[->,vcol,very thick,line cap=round]
\tikzstyle{avec}=[->,acol,very thick,line cap=round]
\tikzstyle{force}=[->,myred,very thick,line cap=round]
\tikzstyle{myarr}=[-{Latex[length=3,width=3]}]
\tikzstyle{mysmallarr}=[-{Latex[length=2,width=2]}]
\tikzstyle{myarr2}=[{Latex[length=2,width=3]}-{Latex[length=2,width=3]}]
\tikzstyle{CM}=[red!40!black,fill=red!80!black!80]
\tikzstyle{origin}=[blue!50!black,fill=blue!80!black!80]
\tikzstyle{mass}=[line width=0.6,draw=red!30!black, %rounded corners=1,
                  top color=red!40!black!30,bottom color=red!40!black!10,shading angle=30]
\tikzstyle{ground}=[preaction={fill,top color=black!15,bottom color=black!8,shading angle=20},
                    fill,pattern=north east lines,thick,minimum width=0.3,minimum height=0.6]
\tikzstyle{metal}=[fill,top color=black!40,bottom color=black!20,shading angle=10]
\tikzstyle{stone}=[fill,top color=black!20,bottom color=black!10,shading angle=10]
\tikzstyle{wood}=[draw=brown!30!black,fill,top color=brown!80!black!60,bottom color=brown!80!black!40,shading angle=10]
\tikzset{
  pics/Tin/.style={
    code={
      \def\R{0.10}
      \draw[pic actions,line width=0.6,#1,fill=white] % ,thick
        (0,0) circle (\R) (-135:.75*\R) -- (45:.75*\R) (-45:.75*\R) -- (135:.75*\R);
 
 
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