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