1. Honors Physics 1Class 14 Fall 2013 • The rotating skew rod • Rotational Inertia Tensor • Stability of spinning objects • The spinning top in gravity

2. The angular momentum vector and angular velocity do not necessarily point in the same direction • Consider a rigid body consisting of two particles of equal mass on the ends of a massless rigid rod of length 2l . The midpoint of the rod is attached to a vertical axis which rotates at angular speed . The rod is skewed at an angle  from the axis. Find the angular momentum of the system.

4. Geometric interpretation of precessionof the skewed rod

5. Moment of Inertia Tensor

6. The spinning bicycle wheel(Gyroscope)

7. Moment of inertia of various objects

8. Stability of spinning objects • Applications: Rolling hula hoops, flying saucers, footballs, rifle bullets... F