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What is the effect of a skater pulling their arms inward during a spin?
The skater's moment of inertia decreases, causing their angular velocity to increase to conserve angular momentum.
What is the effect of applying an external torque to a rotating object?
The object's angular momentum will change.
What happens to the rod's angular speed if the disk bounces back in the disk and rod collision?
The rod's angular speed will be greater because the disk transfers more angular momentum to the rod.
In the Skater Example, what happens to the skater's angular velocity if she decreases her moment of inertia?
The angular velocity increases.
In the Planetary Motion diagram, what force is responsible for the conservation of angular momentum?
Gravitational force.
What are the steps to solve a conservation of angular momentum problem?
1: Identify initial and final states. 2: Determine if external torque is zero. 3: Apply $L_{initial} = L_{final}$. 4: Solve for the unknown.
How does a skater conserve angular momentum?
1: Skater starts spinning with arms out (high $I$, low $\omega$). 2: Skater pulls arms in (low $I$). 3: Angular velocity increases to conserve angular momentum ($L$ remains constant).