AP Physics C: Mechanics Flashcards: Angular Momentum and Angular Impulse
Written by AP Content Team, Verified for 2026 AP Exams, Last updated: May 2026
Review key ideas with interactive flashcards. This set includes 10 cards to help you master important concepts.
How is angular impulse mathematically defined in terms of torque and time?
Angular impulse is defined as the integral of torque over a time interval, given by the equation $\text{angular impulse}=\int_{t_{1}}^{t_{2}}\vec{\tau}dt$.
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How is angular impulse mathematically defined in terms of torque and time?
Angular impulse is defined as the integral of torque over a time interval, given by the equation $\text{angular impulse}=\int_{t_{1}}^{t_{2}}\vec{\tau}dt$.
What is the equation for the magnitude of a rigid system's angular momentum about a specific axis?
The magnitude of the angular momentum is described by the equation $L=I\omega$, where I is the moment of inertia and ω is the angular velocity.
What is angular impulse?
Angular impulse is the integral of the torque exerted on an object or rigid system over a specific time interval.
If a torque is applied to a rigid system over a period of time, what is delivered to the system?
An angular impulse is delivered to the rigid system, which is calculated by integrating the torque over the time interval.
What two quantities determine the angular momentum of a rigid system rotating about a fixed axis?
The angular momentum of a rigid system is determined by its moment of inertia ($I$) and its angular velocity ($\omega$).
To calculate the angular impulse delivered to a system between time $t_1$ and $t_2$, what operation must be performed on the torque function, $\vec{\tau}(t)$?
You must integrate the torque function with respect to time over the interval from $t_1$ to $t_2$.
What is angular momentum?
Angular momentum is a property of an object or rigid system that describes its rotational motion.
What is the vector equation for the angular momentum of an object about a given point?
The angular momentum of an object about a given point is the cross product of its position vector and linear momentum: $\vec{L}=\vec{r}\times\vec{p}$.
A rigid body with a known moment of inertia $I$ and angular velocity $\omega$ is rotating. What expression represents its angular momentum, $L$?
The angular momentum of the rigid body is the product of its moment of inertia and angular velocity, expressed as $L=I\omega$.
Term: $\vec{L}=\vec{r}\times\vec{p}$
This is the equation for the angular momentum of an object about a given point, defined as the cross product of the position vector and the linear momentum vector.