If a figure skating is spinning around with her arms outstretched,why will she s

Question

If a figure skating is spinning around with her arms outstretched,why will she spin faster if she brings her arms in?

1 Energy is always conserved. By bringingher arms in she is decreasing her PE. To keep her total energyconstant her KE must increase. Hence, she spins faster.Momentum is always conserved. By bringingher arms in she is decreasing her mass. With less mass, in order tokeep her momentum constant she must spinfaster.Angular momentum is always conserved. Bybringing her arms in she is decreasing her radius. In order to keepangular momentum from changing, she must spin faster.By bringing in her arms she is reducingthe air drag on her and hence, she spins faster. 1

Explanation / Answer

   Angularmomentum is always conserved. By bringing her arms in she isdecreasing her radius. In order to keep angular momentum fromchanging, she must spin faster

Related Questions

Navigate

• Browse (All)
• Browse I
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.