10. A skater brings her arms in close to her body during a spin. What is the effect on her
angular momentum and angular velocity?
A) Angular momentum increases, velocity increases.
B) Angular momentum decreases, velocity decreases.
C) Angular momentum remains constant, velocity increases.
D) There is insufficient information to tell what will happen
L = Iω
ω = v / r
The Attempt at a Solution
By bringing her arms in closer, she is decreasing the radius of her moment of inertia. As "r" gets smaller, v gets larger so ω becomes larger. When ω becomes larger, L is larger too because they're directly proportional. I choose "A." Do you all agree?