Question 17. A dancer on ice spins faster when she folds here arms. This is due to (a) Increases in energy and increase in angular momentum (b) Decrease in friction at the skates (c) Constant angular momentum and increase in kinetic energy (d) Increase in energy an decreases in angular momentum Answer
If you're initially rotating with your arms outstretched, then when you draw your arms inward, your moment of inertia decreases. This means that your angular velocity must increase, and you spin faster.
