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