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enter image description here

I need help writing this diagram in tikz and my skills are not yet advanced enough to do it. Can any of you help me? Please?

so far all I have done is this

\begin{tikzpicture} 
 \draw (2,2) circle (.5cm);
 \draw (2,2) circle (3cm);
 \draw[-stealth] (-4,4)  arc (80.0026:40:1) ;
\draw [-latex,very thick] (2,2)  -- node [above,near end,rotate=90] {${T}$}(0,-4);


\end{tikzpicture}

But I don't know what to do after or how to do the correct arrow.

EDIT

I got it a bit further but I still need help

\begin{tikzpicture} 
 \draw (2,2) circle (.5cm);
 \draw (2,2) circle (3cm);
 \draw[-stealth] (-4,4)  arc (80.0026:40:1) ;
\draw [very thick, ->] (2,2)  -- (2,-1.5) node [above,near end,rotate=90] {${T}$}(2,-1.5);


\end{tikzpicture}
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  • 1
    Welcome to TeX.SX. Questions about how to draw specific graphics that just post an image of the desired result are really not reasonable questions to ask on the site. Please post a minimal compilable document showing that you've tried to produce the image and then people will be happy to help you with any specific problems you may have. See minimal working example (MWE) for what needs to go into such a document.
    – BambOo
    Apr 23, 2020 at 0:04
  • Saying that your skills are not advanced enough to do it yet, means that you actually have some skills however limited they might be. So please make the effort to show what you have tried so far.
    – BambOo
    Apr 23, 2020 at 0:07
  • I managed to do this so far \begin{tikzpicture} \draw (2,2) circle (.5cm); \draw (2,2) circle (3cm); \draw[stealth] (,-1) arc (80.0026:40:1) ; \end{tikzpicture} Apr 23, 2020 at 0:07
  • A minimal working example as stated before is a complete compilable example. So basically one should be able to obtain a pdf document doing pdflatex yourmwe.tex, which is not the case at the moment. Please also take advantage of the formatting commands when editing your question so that the code is readable
    – BambOo
    Apr 23, 2020 at 0:10
  • Ok. How is that? I'm telling you this is the best I can do. Is there anything you can do to help me? Apr 23, 2020 at 0:19

1 Answer 1

2

Welcome! This is a start. It is really just some basic nodes and path constructions and edges.

\documentclass[tikz,border=3mm]{standalone}
\usetikzlibrary{arrows.meta,bending,quotes}
\begin{document}
\begin{tikzpicture}
 \draw[semithick] (0,0) node[circle,draw,minimum size=5mm] (C){} circle[radius=2cm]
 (0,-4) node[draw,minimum size=5mm,label=below right:{$m\,g$},
    label=30:$P_1$](P1){}
 (0,-6) node[draw,minimum size=5mm,label=left:{$y=0$},
    label=30:$P_2$](P2){}
 (0,-2) coordinate (P) (C) -- (P1);
 \path[semithick,-Triangle,pos=0.9] (C.south) edge["$T$"] ++ (0,-1) 
 (P1.north)  edge["$T$"'] ++ (0,1) (P1.north) edge ++ (0,-1)
  (4,-2) edge["$a$"] ++ (0,-0.5) (4,-4) edge["$a$"] ++ (0,-0.5);
 \draw[-{Stealth[bend]}] (120:2.2) arc[start angle=120,end
 angle=150,radius=2.2] node[midway,above left]{$\alpha$};
 \draw[semithick] (C.120) to[out=30,in=180,looseness=0.6] (2.5,0) 
    to[out=0,in=180,looseness=0.6] (3,0.2)  node[right]{$I$};
\end{tikzpicture}
\end{document}

enter image description here

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    What effect do the quotation marks in edge["$T$"] have?
    – corvus_192
    Apr 23, 2020 at 9:45
  • 2
    @corvus_192 This is a short-hand, enabled by the quotes library, for edge label={$T$}.
    – user194703
    Apr 23, 2020 at 16:56

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