Normal force

Free body diagrams of the normal force of a mass standing on the ground.
For more related figures, please see the “forces” and “Newton’s laws” tag.

Edit and compile if you like:

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% Author: Izaak Neutelings (September 2020)
% Inspiration: https://tex.stackexchange.com/questions/25531/adding-underbrace-in-tikz
\documentclass[border=3pt,tikz]{standalone}
\usepackage{physics}
\usepackage{ifthen}
\usepackage{tikz}
\usetikzlibrary{patterns}
\tikzset{>=latex} % for LaTeX arrow head
\colorlet{myred}{red!65!black}
\colorlet{acol}{red!50!blue!80!black!80}
\tikzstyle{ground}=[preaction={fill,top color=black!10,bottom color=black!5,shading angle=20},
                    fill,pattern=north east lines,draw=none,minimum width=0.3,minimum height=0.6]
\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]
\tikzstyle{rope}=[brown!70!black,line width=1.2,line cap=round] %very thick
% FORCES SWITCH
\tikzstyle{force}=[->,myred,thick,line cap=round]
\newcommand{\vbF}{\vb{F}}
\newboolean{showforces}
\setboolean{showforces}{true}
\begin{document}
% HORIZONTAL ground
\begin{tikzpicture}
  \def\W{2.0} % ground width
  \def\D{0.2} % ground depth
  \def\h{0.6} % mass height
  \def\w{0.8} % mass width
  \draw[ground] (-\W/2,0) rectangle++ (\W,-\D);
  \draw (-\W/2,0) --++ (\W,0);
  \draw[mass] (-\w/2,0) rectangle++ (\w,\h) node[midway] {$m$};
  \ifthenelse{\boolean{showforces}}{
    \draw[->] (1.0*\w,0.5*\h) --++ (0,0.9*\h) node[below=4,right=0] {$y$};
    \draw[force] (-0.3*\w,0.0*\h) --++ (0, 1.4*\h) node[left] {$\vbF_\mathrm{N}$};
    \draw[force] ( 0.3*\w,0.5*\h) --++ (0,-1.4*\h) node[right=5,below=-3] {$\vbF_\mathrm{g} = -mg\vu{y}$};
    %\draw[force] (0,0.9*\h) --++ (0, 1.0*\h) node[left] {$\vbF_\mathrm{N}$};
 
 
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