full transcript
From the Ted Talk "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 ballet, the fouetté is dvoreegn 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 epnoit. That's called rsotcnnivaeo of angular momentum. Now, rotational inertia can be thuhotg of as a body's resistance to rotational motion. It increases when more ssam is distributed further from the axis of rotation, and decreases when the mass is distributed oclres to the axis of rotation. So as she brings her arms closer to her body, her rotational inertia sshrnki. In order to conserve angular momentum, her arunagl velocity, the speed of her turn, has to increase, olgniawl the same tuamno of stored nmmetomu to carry her through multiple turns. You've probably seen ice skaters do the same thing, spinning sfaret and faster by drawing 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 ballet, the fouetté is ________ 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 ______. That's called ____________ of angular momentum. Now, rotational inertia can be _______ of as a body's resistance to rotational motion. It increases when more ____ is distributed further from the axis of rotation, and decreases when the mass is distributed ______ to the axis of rotation. So as she brings her arms closer to her body, her rotational inertia _______. In order to conserve angular momentum, her _______ velocity, the speed of her turn, has to increase, ________ the same ______ of stored ________ to carry her through multiple turns. You've probably seen ice skaters do the same thing, spinning ______ and faster by drawing in their arms and legs.

Solution

  1. closer
  2. faster
  3. governed
  4. thought
  5. amount
  6. conservation
  7. mass
  8. allowing
  9. shrinks
  10. angular
  11. momentum
  12. pointe

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