full transcript
"From the Ted Talk by Arleen Sugano: The physics of the "hardest move" in ballet"

Unscramble the Blue Letters

The other option is for the dancer to bring her arms or leg in closer to her body once she returns to pointe. Why does this work? Like every other turn in belalt, the fouetté is governed by angular momentum, which is equal to the dancer's angular velocity tmeis her rotational iiterna. And except for what's lost to friction, that angular momentum has to stay constant while the dancer is on pointe. That's called conservation of angular meuomntm. Now, rotational inertia can be thought of as a body's resistance to rotational motion. It incresaes when more mass is distributed further from the axis of rtitooan, and decreases when the mass is distributed closer to the axis of rotation. So as she bigrns her arms closer to her body, her raoaonttil inertia sihknrs. In order to conserve angular momentum, her agnular velocity, the speed of her turn, has to increase, allowing the same amuont of stored momentum to carry her through multiple turns. You've probably seen ice skaters do the same thing, spinning faster and faster by danirwg in their arms and legs.

Open Cloze

The other option is for the dancer to bring her arms or leg in closer to her body once she returns to pointe. Why does this work? Like every other turn in ______, the fouetté is governed by angular momentum, which is equal to the dancer's angular velocity _____ her rotational _______. And except for what's lost to friction, that angular momentum has to stay constant while the dancer is on pointe. That's called conservation of angular ________. Now, rotational inertia can be thought of as a body's resistance to rotational motion. It _________ when more mass is distributed further from the axis of ________, and decreases when the mass is distributed closer to the axis of rotation. So as she ______ her arms closer to her body, her __________ inertia _______. In order to conserve angular momentum, her _______ velocity, the speed of her turn, has to increase, allowing the same ______ of stored momentum to carry her through multiple turns. You've probably seen ice skaters do the same thing, spinning faster and faster by _______ in their arms and legs.

Solution

  1. ballet
  2. rotational
  3. shrinks
  4. brings
  5. amount
  6. times
  7. increases
  8. inertia
  9. rotation
  10. drawing
  11. angular
  12. momentum

Original Text

The other option is for the dancer to bring her arms or leg in closer to her body once she returns to pointe. Why does this work? Like every other turn in ballet, the fouetté is governed by angular momentum, which is equal to the dancer's angular velocity times her rotational inertia. And except for what's lost to friction, that angular momentum has to stay constant while the dancer is on pointe. That's called conservation of angular momentum. Now, rotational inertia can be thought of as a body's resistance to rotational motion. It increases when more mass is distributed further from the axis of rotation, and decreases when the mass is distributed closer to the axis of rotation. So as she brings her arms closer to her body, her rotational inertia shrinks. In order to conserve angular momentum, her angular velocity, the speed of her turn, has to increase, allowing the same amount of stored momentum to carry her through multiple turns. You've probably seen ice skaters do the same thing, spinning faster and faster by drawing in their arms and legs.

ngrams of length 2

collocation frequency
angular momentum 5
rotational inertia 3

Important Words

  1. allowing
  2. amount
  3. angular
  4. arms
  5. axis
  6. ballet
  7. body
  8. bring
  9. brings
  10. called
  11. carry
  12. closer
  13. conservation
  14. conserve
  15. constant
  16. dancer
  17. decreases
  18. distributed
  19. drawing
  20. equal
  21. faster
  22. friction
  23. governed
  24. ice
  25. increase
  26. increases
  27. inertia
  28. leg
  29. legs
  30. lost
  31. mass
  32. momentum
  33. motion
  34. multiple
  35. option
  36. order
  37. pointe
  38. resistance
  39. returns
  40. rotation
  41. rotational
  42. shrinks
  43. skaters
  44. speed
  45. spinning
  46. stay
  47. stored
  48. thought
  49. times
  50. turn
  51. turns
  52. velocity
  53. work