Otdfbt

A similar example:

documentclass[tikz]standalone
usetikzlibrarypositioning
begindocument
 begintikzpicture[
 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

beginscope;
 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] $Mg$;
endscope;

%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] $mg$;
;

 endtikzpicture
enddocument

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
usepackagesiunitx
begindocument
begintikzpicture[>=stealth]
draw[dashed,very thin] (0,-1) grid (7.5,1);
draw[->] (0,-2)--(0,2) node[left] $x;(sicentimetre)$;
draw[->] (-1,0)--(8.5,0) node[below] $t;(SI-e2second)$;
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] $10$;
endtikzpicture
enddocument

documentclass[tikz]standalone
begindocument
begintikzpicture[>=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);
endtikzpicture
enddocument

documentclass[tikz]standalone
usetikzlibrarydecorations.pathmorphing
begindocument
begintikzpicture
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] $B$;
endtikzpicture
enddocument

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

documentclass[tikz,border=3.14mm]standalone
usetikzlibrarydecorations.pathmorphing
begindocument
begintikzpicture
 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);
endtikzpicture
enddocument