# L09b - Physics 111 Lecture 9b &quot;People are just about...

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1 / 10 Physics 111 Lecture 9b “People are just about as happy as they make up their mind to be.” –Abraham Lincoln

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Moment of Inertia Moment of Inertia Question Newton’s Laws for rotation Rotational Kinetic energy Rotational Work Question Example 2 / 10 Sometimes two rigid bodies that have the same mass will have diferent rotational properties. One may be harder to rotate than another (roasting potatoes and a lamb) When it comes to rotation, not only you have to take into account how much mass is present, but you also have to take into account how the mass is distributed compared to the axis oF rotation To quantiFy this, we introduce the moment of inertia I ±or a system oF discrete particles, I is given by I = s i m i r 2 i (1) Example: What is the moment oF inertia oF two balls (each oF mass 1 . 0 kg) moving around a common center? One ball is at r = 2 . 0 m and the other at r = 3 . 0 m
Moment of Inertia Moment of Inertia Question Newton’s Laws for rotation Rotational Kinetic energy Rotational Work Question Example 3 / 10 As we shall see, I is the rotational analog of mass m , and this is why I is a measure of the resistance of a

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## This note was uploaded on 04/22/2008 for the course PHYS 111 taught by Professor Madrid during the Winter '08 term at Ohio State.

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L09b - Physics 111 Lecture 9b &quot;People are just about...

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