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Basics of Fluid Mechanics, 2014a

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3.5. ANGULAR MOMENTUM AND TORQUE 67<br />

Table -3.1. Moments <strong>of</strong> Inertia for various plane surfaces about their center <strong>of</strong> gravity (full<br />

shapes)<br />

Shape<br />

Name<br />

Picture<br />

description<br />

x c , y c A Ixx<br />

Rectangle<br />

XX<br />

b<br />

b/2<br />

b<br />

2 ; a 2<br />

ab<br />

ab 3<br />

12<br />

a<br />

Triangle<br />

XX<br />

b<br />

b/3<br />

a<br />

3<br />

ab<br />

3<br />

ab 3<br />

36<br />

a<br />

Circle<br />

XX<br />

a = b<br />

b<br />

b/2<br />

b<br />

2<br />

πb 2<br />

4<br />

πb 4<br />

64<br />

a<br />

Ellipse<br />

XX<br />

a > b<br />

b<br />

b/2<br />

b<br />

2<br />

b<br />

2<br />

πab<br />

4<br />

Ab 2<br />

64<br />

a<br />

y = αx 2<br />

Parabola<br />

XX<br />

b<br />

x c<br />

3 αb<br />

15 α−5<br />

6α−2<br />

3<br />

×<br />

( b<br />

α)3<br />

2<br />

√<br />

b (20 b 3 −14 b 2 )<br />

35 √ α<br />

a

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