Calculating Moment of Inertia The squared distance from each point mass to the axis is Using the Pythagorean Theorem s0/=m=m2+m+m2+m=4m 1= 2mL2 L2 m● m m m Physics 121: Lecture 18, Pg 6Physics 121: Lecture 18, Pg 6 Calculating Moment of Inertia... The squared distance from each point mass to the axis is: m m m m L r L/2 2 L 2 L r 2 2 2 2  =      = 2 L 4m 2 L m 2 L m 2 L m 2 L I m r m 2 2 2 2 2 N i 1 2 =  i i = + + + = = so I = 2mL2 Using the Pythagorean Theorem