Torque

Basics of torque with a bicycle wheel and balancing masses on a seesaw.
For related figures, please see the “torque” and “stability” tags. These figures are used in Ben Kilminster’s lecture notes for PHY111.

Applying a torque on a bicycle wheel tangentially to cause maximum rotation.

Applying a torque on a bicycle wheel towards the point of rotation.

Applying a torque on a bicycle wheel with an angle.

Balancing the torques of two masses on a seesaw to illustrate static equilibrium.

Edit and compile if you like:

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% Author: Izaak Neutelings (October 2020)
\documentclass[border=3pt,tikz]{standalone}
\usepackage{physics}
\usepackage{tikz}
\usepackage[outline]{contour} % glow around text
\usetikzlibrary{calc}
\usetikzlibrary{angles,quotes} % for pic
\tikzset{>=latex} % for LaTeX arrow head
\contourlength{1.1pt}
\colorlet{xcol}{blue!98!black}
\colorlet{xcoldark}{blue!50!black}
\colorlet{vcol}{green!70!black}
\colorlet{myred}{red!80!black}
\colorlet{mypurple}{blue!60!red!80}
\colorlet{acol}{red!50!blue!80!black!80}
\tikzstyle{rvec}=[->,xcol,very thick,line cap=round]
\tikzstyle{force}=[->,myred,very thick,line cap=round]
\tikzstyle{mass}=[line width=0.6,red!30!black,fill=red!40!black!10,rounded corners=1,
                  top color=red!40!black!20,bottom color=red!40!black!10,shading angle=20]
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        (0,0) circle (\R) (-135:.75*\R) -- (45:.75*\R) (-45:.75*\R) -- (135:.75*\R);
  }},
  pics/Tout/.style={
    code={
      \def\R{0.12}
      \draw[pic actions,line width=0.6,#1,fill=white] (0,0) circle (\R);
      \fill[pic actions,#1] (0,0) circle (0.3*\R);
  }},
  pics/Tin/.default=mypurple,
  pics/Tout/.default=mypurple,
}
\newcommand\rightAngle[4]{
  \pgfmathanglebetweenpoints{\pgfpointanchor{#2}{center}}{\pgfpointanchor{#3}{center}}
  \coordinate (tmpRA) at ($(#2)+(\pgfmathresult+45:#4)$);
 
 
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