1. The Physics of Rotation
We’re on a roll!
The Physics of Rotation

2. Rotational Energy
Chapter C9

3. Key Concepts … Rotating masses possess rotational energy
An object can have both kinetic and rotational energy
Moment of Inertia measures distribution of mass wrt CM
Two identical mass objects can have very different moments of inertia
Simple mathematical relationship links angular velocity to linear velocity as long as no skidding takes place

4. Two-minute Problems…
C9T.1
C9T.4
C9T.8

5. What’s Rotational Energy
It’s a natural extension of the concept of kinetic energy
Angular velocity
Moment of inertia

6. Going from the translational world to the rotational world…
Radian measure

7. How fast should the billiard ball from last week’s experiment have moved?
Just add a new type of energy term: