Hcfyk

A similar example:

documentclass[tikz]{standalone}

usetikzlibrary{positioning}

begin{document}

  begin{tikzpicture}[

    force/.style={>=latex,draw=blue,fill=blue},

    axis/.style={densely dashed,gray,font=small},

    M/.style={rectangle,draw,fill=lightgray,minimum size=0.5cm,thin},

    m/.style={rectangle,draw=black,fill=gray,minimum size=0.3cm,thin},

    plane/.style={draw=black,fill=blue!10},

    string/.style={draw=red, thick},

    pulley/.style={draw, thick, circle},

    ]

    %mainshape



    filldraw[blue!30!white, draw=black] (0,0) coordinate (b) rectangle (3,1) coordinate (c);

%   draw[pulley] (3.1,1.2) circle (0.25cm);

    node (pulley) [pulley, minimum width=.5cm, anchor=south west] at (c) {};

    filldraw[gray!40!white, draw=black] (1.5,1.05) rectangle (2,1.55);

    draw[red,thick] (2,1.2)--(pulley.west);

    filldraw[gray, draw=black] (3.10, 0.1) rectangle (3.6, 0.6) coordinate (a);

    draw[red,thick] (a -| pulley.south)--(pulley.south);



%FBD1



begin{scope};

  node[M, right=50pt of a](M){};

  {[axis,->]

    draw (0,-1) -- (0,2) node[right] {$+y$};

    draw (M) -- ++(2,0) node[right] {$+x$};}

  {[force,->]

    % Assuming that Mg = 1. The normal force will therefore be cos(alpha)

    draw (M.center) -- ++(0,1) node[above right] {$F_N$};

    draw (M.west) -- ++(-1,0) node[left] {$F_f$};

    draw (M.east) -- ++(1,0) node[above] {$T$};}

  draw[force,->] (M.center)-- ++(0,-1) node[below] {$Mg$};

end{scope};



%FBD2

node[m, left=25pt of b] (m) {};

draw[axis,->] (m) -- ++(0,-2) node[left] {$+$};

{[force,->]

  draw (m.north) -- ++(0,1) node[above] {$T'$};

  draw (m.south) -- ++(0,-1) node[right] {$mg$};

};



  end{tikzpicture}

end{document}

Actually these pictures don't take much time. It is good that you show some codes, but those codes seem to be unrelevant.

documentclass[tikz]{standalone}

usepackage{siunitx}

begin{document}

begin{tikzpicture}[>=stealth]

draw[dashed,very thin] (0,-1) grid (7.5,1);

draw[->] (0,-2)--(0,2) node[left] {$x;(si{centimetre})$};

draw[->] (-1,0)--(8.5,0) node[below] {$t;(SI{-e2}{second})$};

draw plot[smooth,samples=500,domain=0:7] (x,{cos(deg(pi*x/2))});

foreach i in {5,10,...,35} draw (i/5,0) node[below] {$i$};

draw (0,0) node[below left] {$0$} (0,-1) node[left] {$-10$} (0,1) node[left] {$10$};

end{tikzpicture}

end{document}

documentclass[tikz]{standalone}

begin{document}

begin{tikzpicture}[>=stealth]

draw[<->] (0,-3) node[left] {$y$} -- (0,-2) node[left] {$O_y$} -- (0,0) node[above left] {$O$} -- (2,0) node[above] {$O_x$} -- (3,0) node[above] {$x$};

fill (0,-2) circle (1pt) (0,0) circle (1pt) (2,0) circle (1pt);

end{tikzpicture}

end{document}

documentclass[tikz]{standalone}

usetikzlibrary{decorations.pathmorphing}

begin{document}

begin{tikzpicture}

draw[fill=yellow] (0,0) rectangle (4.5,-.2);

draw (3,0.03) rectangle (4,.5);

draw (0,0) -- (-.25,.25);

fill (-.25,.25) circle (1pt);

draw (-.75,-2.5) rectangle (.25,-2.97);

draw[decoration={aspect=0.3,segment length=1.5mm, amplitude=2mm,coil},decorate] (0,.25) -- (3,.25);

draw[decoration={aspect=0.3,segment length=1.5mm, amplitude=2mm,coil},decorate] (-.25,0) -- (-.25,-2.5);

draw (-.25,0)|-(0,.25);

draw (3.5,0.5) node[above] {$A$} (-.75,-2.75) node[left] {$B$};

end{tikzpicture}

end{document}

JouleV and Zarko are around, if you are lucky they do the other two pics.

documentclass[tikz,border=3.14mm]{standalone}

usetikzlibrary{decorations.pathmorphing}

begin{document}

begin{tikzpicture}

 node[draw,label=left:$B$,minimum width=2em,minimum height=1em] (B){};

 node[draw,label=above:$A$,minimum width=2em,minimum height=1.5em] (A) at (2,2){};

 node[circle,fill,inner sep=1.5pt] (C) at (B|-A){};

 draw[decorate,decoration={coil,segment length=3pt}] (B)  -- (C)  -- (A);

 draw[fill=gray] ([xshift=1em,yshift=-pgflinewidth]A.south east) rectangle ++

 (-2.4,-0.2);

end{tikzpicture}

end{document}