What keeps pendulum swinging?

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Tags

  1. #forever
  2. #resistance
  3. #pendulum
  4. #moving
  5. #swing
  6. #gradually
  7. #steal
  8. #artwork
  9. #constantly
  10. #potential
  11. #reality
  12. #energy
  13. #would
  14. #friction
  15. #kinetic
  16. #there
  17. #comes
  18. #swapping