斜面滚动模型
\[\left\{\begin{array}
Mg\sin(\theta)-F_{\text{friction}}=Ma_{cm}
\\
F_{friction}=\frac{I\alpha}{r}
\\
r\alpha=a_{cm}
\end{array}\right.
\]

\[\left\{\begin{array}
Mg\sin(\theta)-F_{\text{friction}}=Ma_{cm}
\\
F_{\text{friction}}=\frac{I\alpha}{r}
\\
r\alpha=a_{cm}
\end{array}\right.
\]
　　　　------baka baka!! Anata ha Baka desu!！！！

[asy]
defaultpen(fontsize(6pt));
dotfactor=4;
label("$\circ$",(0,1));
label("$\circ$",(0.865,0.5));
label("$\circ$",(-0.865,0.5));
label("$\circ$",(0.865,-0.5));
label("$\circ$",(-0.865,-0.5));
label("$\circ$",(0,-1));
dot((0,1.5));
dot((-0.4325,0.75));
dot((0.4325,0.75));
dot((-0.4325,-0.75));
dot((0.4325,-0.75));
dot((-0.865,0));
dot((0.865,0));
dot((-1.2975,-0.75));
dot((1.2975,-0.75));
draw(Arc((0,1),0.5,210,-30));
draw(Arc((0.865,0.5),0.5,150,270));
draw(Arc((0.865,-0.5),0.5,90,-150));
draw(Arc((0.865,-0.5),0.5,90,-150));
draw(Arc((0,-1),0.5,30,150));
draw(Arc((-0.865,-0.5),0.5,330,90));
draw(Arc((-0.865,0.5),0.5,-90,30));[/asy]

嗯

\left\{\begin{array} mg\sin(\theta)-F_{\text{friction}}=ma_{cm} \\ F_{\text{friction}}=\frac{I\alpha}{r} \\ r\alpha=a_{cm} \end{array}\right.

TIME

\[\left\{ \eqalign{ Mg\sin(\theta)-F_{\text{friction}}=Ma_{cm} \\ F_{\text{friction}}=\frac{I\alpha}{r} \\ r\alpha=a_{\text{cm}} }\right.\]
　　　　------░░░░▄▄▄▄▀▀▀▀▀▀▀▀▄▄▄▄▄▄
░░░█░░░░▒▒▒▒▒▒▒▒▒▒▒▒░░▀▀▄
░░█░░░▒▒▒▒▒▒░░░░░░░░▒▒▒░░█
░█░░░░░░▄██▀▄▄░░░░░▄▄▄░░░█
█░▄▄▄▒░█▀▀▀▀▄▄█░░░██▄▄█░░░█
█░▒▄░▀▄▄▄▀░░░░░░░░█░░░▒▒▒▒▒█
█░░░█▄░█▀▄▄░▀░▀▀░▄▄▀░░░░█░░█
░█░░▀▄▀█▄▄░█▀▀▀▄▄▄▄▀▀█▀██░█
░░█░░██░░▀█▄▄▄█▄▄█▄████░█
░░░█░░░▀▀▄░█░░░█░███████░█
░░░░▀▄░░░▀▀▄▄▄█▄█▄█▄█▄▀░░█
░░░░░░▀▄▄░▒▒▒▒░░░░░░░░░░█
░░░░░░░░█▀▀▄▄░▒▒▒▒▒▒▒▒▒▒░█

\[\Large\text{Review}\]