1. thermometer
  2. force
  3. power plug
  4. prism
  5. speaker
  6. refraction
  7. battery
  8. light bulb
  9. weight
  10. gravity
  11. heat
  12. three dimensional
  13. magnet
  14. spaceship
  15. molecule
  16. solid
  17. pulley
  18. Slope
  19. sun
  20. gas
  21. liquid
  22. radiation
  23. dispersion
  24. volume
  25. friction
  26. pendulum
  27. motion
  28. clock
  29. length
  30. pressure
  31. force
  32. cogwheel
  33. spring
  34. Electron
  35. Proton
  36. quantum
  37. orbit
  38. chromatic
  39. astronomy
  40. voltmeter
  41. barometer
  42. planet earth
  43. magnetic field
  44. sound wave
  45. tunning fork
  46. communicating vessels
  47. vacuum chamber
  48. balance scale
  49. balance scale
  50. schrodingers cat
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