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<strong>경상대학교</strong> 물리학과 김현수<br />
9-7<br />
2. 강체의 회전운동에너지<br />
x<br />
y<br />
m i<br />
o<br />
R i<br />
z<br />
<strong>ω</strong><br />
r i<br />
θ i<br />
n<br />
L<br />
<strong>ω</strong><br />
v<br />
r<br />
<strong>ω</strong><br />
v<br />
r<br />
<strong>ω</strong><br />
C<br />
B<br />
A<br />
C<br />
B<br />
A<br />
v<br />
r<br />
<strong>ω</strong><br />
v<br />
v<br />
r<br />
<strong>ω</strong><br />
v<br />
⋅<br />
=<br />
×<br />
⋅<br />
=<br />
×<br />
⋅<br />
=<br />
×<br />
⋅<br />
=<br />
⋅<br />
×<br />
⋅<br />
×<br />
=<br />
⋅<br />
=<br />
×<br />
=<br />
∑<br />
∑<br />
∑<br />
∑<br />
2<br />
1<br />
)<br />
(<br />
2<br />
1<br />
)<br />
(<br />
)<br />
(<br />
)<br />
(<br />
)<br />
(<br />
2<br />
1<br />
2<br />
1<br />
2<br />
1<br />
i<br />
i<br />
i<br />
i<br />
i<br />
i<br />
i<br />
i<br />
rot<br />
i<br />
i<br />
i<br />
i<br />
i<br />
i<br />
i<br />
i<br />
rot<br />
i<br />
i<br />
m<br />
m<br />
T<br />
m<br />
m<br />
T<br />
회전운동에서<br />
[ ] ( )<br />
z<br />
y<br />
yz<br />
z<br />
x<br />
xz<br />
y<br />
x<br />
xy<br />
z<br />
zz<br />
y<br />
yy<br />
x<br />
xx<br />
z<br />
y<br />
x<br />
zz<br />
zy<br />
zx<br />
yz<br />
yy<br />
yx<br />
xz<br />
xy<br />
xx<br />
z<br />
y<br />
x<br />
rot<br />
rot<br />
cm<br />
trans<br />
rot<br />
cm<br />
trans<br />
cm<br />
cm<br />
I<br />
I<br />
I<br />
I<br />
I<br />
I<br />
I<br />
I<br />
I<br />
I<br />
I<br />
I<br />
I<br />
I<br />
I<br />
T<br />
T<br />
T<br />
T<br />
T<br />
T<br />
m<br />
<strong>ω</strong><br />
<strong>ω</strong><br />
<strong>ω</strong> <strong>ω</strong><br />
<strong>ω</strong> <strong>ω</strong><br />
<strong>ω</strong><br />
<strong>ω</strong><br />
<strong>ω</strong><br />
<strong>ω</strong><br />
<strong>ω</strong><br />
<strong>ω</strong><br />
<strong>ω</strong><br />
<strong>ω</strong><br />
<strong>ω</strong> 2<br />
2<br />
2<br />
2<br />
1<br />
2<br />
1<br />
~<br />
2<br />
1<br />
2<br />
1<br />
,<br />
2<br />
1<br />
2<br />
1<br />
2<br />
1<br />
,<br />
2<br />
2<br />
2<br />
+<br />
+<br />
+<br />
+<br />
+<br />
=<br />
⎥<br />
⎥<br />
⎥<br />
⎦<br />
⎤<br />
⎢<br />
⎢<br />
⎢<br />
⎣<br />
⎡<br />
⎥<br />
⎥<br />
⎥<br />
⎦<br />
⎤<br />
⎢<br />
⎢<br />
⎢<br />
⎣<br />
⎡<br />
=<br />
=<br />
⋅<br />
⋅<br />
=<br />
⋅<br />
+<br />
⋅<br />
=<br />
+<br />
=<br />
⋅<br />
=<br />
=<br />
<strong>ω</strong>I<strong>ω</strong><br />
<strong>ω</strong><br />
I<br />
<strong>ω</strong><br />
p<br />
v<br />
L<br />
<strong>ω</strong><br />
p<br />
v<br />
v<br />
p<br />
v<br />
강체의전체운동에너지<br />
인 입자계의 병진운동에너지<br />
입자계의운동량이<br />
질량중심의속도가<br />
행렬표기<br />
[예제 9.3] (a) x축에 대한 회전 (정사각판)<br />
[ ]<br />
2<br />
2<br />
2<br />
2<br />
3<br />
2<br />
3<br />
1<br />
4<br />
1<br />
4<br />
1<br />
3<br />
1<br />
2<br />
2<br />
6<br />
1<br />
2<br />
1<br />
3<br />
1<br />
0<br />
0<br />
1<br />
0<br />
0<br />
0<br />
0<br />
1 0 0<br />
2<br />
1<br />
~<br />
2<br />
1<br />
<strong>ω</strong><br />
<strong>ω</strong><br />
<strong>ω</strong><br />
ma<br />
ma<br />
ma<br />
T<br />
=<br />
⋅<br />
=<br />
⎥<br />
⎥<br />
⎥<br />
⎦<br />
⎤<br />
⎢<br />
⎢<br />
⎢<br />
⎣<br />
⎡<br />
⎥<br />
⎥<br />
⎥<br />
⎦<br />
⎤<br />
⎢<br />
⎢<br />
⎢<br />
⎣<br />
⎡<br />
−<br />
−<br />
= I<strong>ω</strong> =<br />
<strong>ω</strong><br />
(b) 대각선축에 대한 회전<br />
[ ]<br />
2<br />
2<br />
2<br />
1<br />
2<br />
1<br />
3<br />
2<br />
3<br />
1<br />
4<br />
1<br />
4<br />
1<br />
3<br />
1<br />
2<br />
1<br />
2<br />
1<br />
2<br />
2<br />
24<br />
1<br />
0<br />
0<br />
0<br />
0<br />
0<br />
0<br />
2<br />
1<br />
<strong>ω</strong><br />
<strong>ω</strong><br />
ma<br />
ma<br />
T<br />
=<br />
⎥<br />
⎥<br />
⎥<br />
⎦<br />
⎤<br />
⎢<br />
⎢<br />
⎢<br />
⎣<br />
⎡<br />
⎥<br />
⎥<br />
⎥<br />
⎦<br />
⎤<br />
⎢<br />
⎢<br />
⎢<br />
⎣<br />
⎡<br />
−<br />
−<br />
=