All Flashcards
Define angular momentum.
The 'rotational oomph' of an object; the tendency of a rotating object to keep rotating.
What is moment of inertia?
A measure of how hard it is to change an object's rotation.
Define angular velocity.
How fast an object is spinning.
What is torque?
Rotational force that causes things to rotate.
Define angular impulse.
The product of torque and time; what changes an object's angular momentum.
What is net torque?
The sum of all torques acting on an object.
What is angular acceleration?
The rate of change of angular velocity.
What is the effect of applying a torque to an object?
The object experiences angular acceleration.
What happens when a spinning skater pulls their arms inward?
Their moment of inertia decreases, and their angular velocity increases (angular momentum remains constant).
What is the effect of a net torque acting on an object over time?
The object's angular momentum changes.
What happens when angular impulse is applied to a rotating object?
The object's angular momentum changes.
What is the effect of increasing the distance (r) of a point object from a reference point on its angular momentum?
The angular momentum increases (assuming other variables remain constant).
What happens to the angular momentum if no external torque acts on a system?
The angular momentum of the system remains constant (conservation of angular momentum).
What is Angular Momentum?
The tendency of an object to keep rotating; the rotational version of linear momentum. A vector quantity with magnitude and direction.
Define Moment of Inertia.
The resistance of an object to rotational motion (kg·m²).
What is Angular Velocity?
The rate at which an object is rotating or revolving, measured in radians per second (rad/s).
Define Angular Impulse.
The change in angular momentum caused by a torque acting over a time interval.
What is Torque?
A rotational force (N·m).
What is the Impulse-Momentum Theorem for Rotation?
The angular impulse equals the change in angular momentum: