1. gravity
  2. voltmeter
  3. chromatic
  4. planet earth
  5. length
  6. weight
  7. sun
  8. heat
  9. gas
  10. liquid
  11. solid
  12. battery
  13. magnet
  14. radiation
  15. prism
  16. dispersion
  17. refraction
  18. volume
  19. friction
  20. pulley
  21. Slope
  22. pendulum
  23. motion
  24. clock
  25. pressure
  26. force
  27. cogwheel
  28. spring
  29. force
  30. molecule
  31. Electron
  32. Proton
  33. quantum
  34. orbit
  35. astronomy
  36. spaceship
  37. thermometer
  38. speaker
  39. barometer
  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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