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