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Section 8.8
Angular Momentum and Its Conservation
Rotational Kinetic Energy
   How do I calculate angular
    momentum?

   How do I apply conservation of
    momentum to angular momentum?
Angular Momentum

Conservation of Angular
Momentum

•   Systems can change their rotational
    inertia
•   Must be internal forces that change the
    rate of rotation




         Angular Momentum
Example
A small mass m, attached to the end of a
string revolves in a circle on a frictionless
table top. The other end of the string passes
through a hole in the table. Initially, the mass
revolves with a speed v1 of 2.4 m/s. The
string is then pulled slowly through the hole
so that the radius is reduced to r2 = 0.48 m.
What is the speed v2 of the mass now?
Homework
   Page 222, # 51 - 56
Homework
   Page 222, # 57 - 62

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Advanced/Notes 8.8