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.

Angular momentum is for rotational motion, while linear momentum is for straight-line motion. Both are conserved, but under different conditions.

Internal forces do not change the total angular momentum of a system. External forces (torques) are required to change the total angular momentum.

Zero external torque: Angular momentum is conserved and remains constant. Nonzero external torque: Angular momentum changes due to angular impulse from the torque.

Moment of inertia (I) is the resistance to rotational change, while angular velocity (ω) is the rate of rotation. Angular momentum (L) is the product of these two: L = Iω.

Rigid system: Moment of inertia is constant unless external forces act. Non-rigid system: Moment of inertia can change due to changes in shape or mass distribution, affecting angular speed.

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.