AP Physics 1: Algebra-Based 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 11 cards to help you master important concepts.
What is the equation for the magnitude of the angular momentum of an object about a given point?
The magnitude of the angular momentum of an object about a given point is given by the equation L = r⊥mv = rmvsinθ.
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What is the equation for the magnitude of the angular momentum of an object about a given point?
The magnitude of the angular momentum of an object about a given point is given by the equation L = r⊥mv = rmvsinθ.
What is angular momentum?
Angular momentum is a property of a rotating object or system, with its magnitude described by L = Iω for a rigid system or L = r⊥mv for an object about a point.
What physical quantity is represented by the product τ_avg Δt?
The product of the average torque and the time interval (τ_avg Δt) represents the angular impulse delivered to an object or rigid system.
Describe how a torque affects an object's angular momentum.
A torque applied over a time interval delivers an angular impulse to an object, which results in a change in the object's angular momentum.
What is the equation for the magnitude of the angular momentum of a rigid system about a specific axis?
The magnitude of the angular momentum of a rigid system about a specific axis can be described with the equation: L = Iω.
A spinning ice skater pulls her arms in, creating a brief internal torque. What concept describes the product of this torque and the short time it is applied?
The product of the torque exerted and the time interval during which it is exerted is defined as the angular impulse.
State the angular impulse-momentum theorem.
The change in angular momentum of an object or rigid system is equal to the angular impulse given to that object or rigid system (ΔL = angular impulse).
How is angular impulse defined?
Angular impulse is defined as the product of the average torque exerted on an object and the time interval during which the torque is exerted (angular impulse = τ_avg Δt).
If a net torque is applied to a rigid system over a period of time, what will be the effect on the system's angular momentum?
Applying a net torque over a time interval delivers an angular impulse, which causes a change in the system's angular momentum.
What is the fundamental relationship between angular impulse and angular momentum?
The angular impulse exerted on an object or rigid system is equal to the change in angular momentum of that object or rigid system.
How can you calculate the change in angular momentum (ΔL) of a system if the average torque and the time interval of its application are known?
The change in angular momentum is equal to the angular impulse, which is calculated as the product of the average torque and the time interval (ΔL = τ_avg Δt).