# Figure Skater Moment of Inertia#

A figure skater begins a spin with their arms out and during the spin, they move their arms in. This changes their moment of inertia from $$I\_{\text{arms {{ params.arms1 }}}} = {{ params.I1 }}$$ $$\rm{kgm^2}$$ to $$I\_{\text{arms {{ params.arms2 }}}} = {{ params.I2 }}$$ $$\rm{kgm^2}$$ during their spin.

## Part 1#

What happens to their angular speed during their spin?

• It decreases by a factor of 3.

• It decreases by a factor of 9.

• It increases by a factor of 3.

• It increases by a factor of 9.

• It does not change.

## Part 2#

What happens to their rotational kinetic energy during their spin?

• It decreases by a factor of 3.

• It decreases by a factor of 9.

• It increases by a factor of 3.

• It increases by a factor of 9.

• It does not change.