1. Chapter 8 Rotational Equilibrium and Dynamics
pgs

2. Objectives
Calculate angular momentum of an object in rotational motion.
Describe conservation of angular momentum of a system.

3. Angular Momentum (L)
The product of a rotating object’s moment of inertia and angular speed
Units of kg•m2/s

5. Conservation of Angular Momentum
Angular momentum is neither gained nor lost
Li = Lf
I1ω1i + I2ω2i = I1ω1f + I2ω2f
I1ω1i + I2ω2i = (I1 + I2)ωf
(I1 + I2)ωi = I1ω1f + I2ω2f

6. A 65 kg student is spinning on a merry-go-round that has a mass of 525 kg and a radius of 2.00 m. She walks from the edge of the merry-go-round toward the center. If the angular speed of the merry-go-round is initially 0.20 rad/s, what is its angular speed when the student reaches a point 0.5 m from the center?