It changes the object's angular momentum.

Their moment of inertia decreases, and their angular speed increases, conserving angular momentum.

The total angular momentum of the system is conserved.

The angular speed increases to conserve total angular momentum.

It changes the object's angular momentum.

The total angular momentum of a closed system remains constant unless acted upon by an external torque.

Angular impulse is the product of the net torque and the time interval over which it acts. Units are $\text{kg} \cdot \text{m}^2/\text{s}$.

A measure of an object's resistance to changes in its rotation rate. It depends on the mass distribution of the object and the axis of rotation.

A system where no external torques act upon it, allowing angular momentum to be conserved.

The rotational equivalent of linear momentum. For a point particle, it is given by $\vec{L} = \vec{r} \times \vec{p}$, where $\vec{r}$ is the position vector and $\vec{p}$ is the linear momentum.

Angular impulse can be calculated using the integral $\int \vec{\tau} dt$ or $\vec{\tau} \Delta t$ for a constant torque.

Add up the angular momenta of all its parts, considering each component's angular momentum relative to the axis of rotation.

The change in angular momentum $\Delta \vec{L}$ is equal to the angular impulse.

Since $L = I\omega$ is constant, if I decreases, then ω must increase proportionally to keep L constant.

Apply the principle of conservation of angular momentum, considering the angular impulse during the collision to relate initial and final angular momenta.