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?

Answer Section#

  • 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?

Answer Section#

  • 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.

Attribution#

Problem is licensed under the CC-BY-NC-SA 4.0 license.
The Creative Commons 4.0 license requiring attribution-BY, non-commercial-NC, and share-alike-SA license.