## Rolling, Torque, and Angular Momentum

- Rigid-body rotation about a moving axis and rolling as a superposition of translation and rotation
- Example: Race of the rolling objects
- Lecture (15:23)
*Demonstration of rolling differently shaped objects down a ramp, and the calculation of the rolling speed in terms of the rotational inertia*

- Angular momentum
- Lecture (11:05)
*Definition of angular momentum, and torque as the change in the angular momentum of an object*

- Conservation of angular momentum
- Lecture (8:00)
*The angular momentum of an object is conserved when not acted upon by a net force, and consequence on rotational velocity when rotational inertia changes*

- Gyroscopes and precession
- Lecture (19:05)
*A gyroscope as a device the holds a fixed orientation due to momentum conservation, and explanation of precession about its axis due to gravitational torque*