AP Physics C: Mechanics / Unit 6: Energy and Momentum of Rotating Systems
6.3 Angular Momentum and Angular Impulse
Notes
- Rigid object: $L=I\omega$. Point mass: $L=mvr_\perp$.
- Angular impulse: $\tau\Delta t=\Delta L$.
Practice
$I=3$ kg·m², $\omega=4$ rad/s. $L=$
$I\omega$.
A 6 N·m torque for 2 s changes $L$ by:
$\tau\Delta t$.
Angular momentum is to rotation as ___ is to linear motion.
$L=I\omega$ like $p=mv$.
A point mass moving in a straight line past a pivot has angular momentum:
$\vec L=\vec r\times\vec p$.
Ready for more? Take the Unit 6 test.