How to calibrate a thermometer? How does the pendulum clock work? How to adjust pendulum clocks?

1. How to calibrate a thermometer? How does the Pendulum Clock work?

2. How to calibrate a thermometer?

5. Temperature For more details, go to http://en.wikipedia.org/wiki/SI SI unit = International System of Units SI unit °C means

6. Temperature For more details, go to http://en.wikipedia.org/wiki/SI SI unit = International System of Units Kelvin (K) SI unit degree C elcius ° C means

7. Parall a x Error (‘ reading error caused by incorrect eye position’)

8. Parall a x Error (‘ reading error caused by incorrect eye position’)

9. 18 °C 19 °C 17 °C How to read a thermometer?

13. Thermometer Theory Workbook p.19 Q.2, 3

21. 4. 3 cm 13 cm 0 °C 100 °C water 5.2 cm 5.2cm - 3cm x 100 °C 13cm - 3cm 22 °C Unknown temperature can be determined by proportionality in mercury length. For example: ??? °C

22. Thermometer Theory Workbook p.19 Q.5

25. How does the Pendulum Clock work?

26. Time

27. Time For more details, go to http://en.wikipedia.org/wiki/SI SI unit = International System of Units 1 min = ‘ s ’ means SI unit 1 h = ‘ min ’ means ‘ h ’ means

28. Time For more details, go to http://en.wikipedia.org/wiki/SI SI unit = International System of Units 60 s 1 min = second ‘ s ’ means second (s) SI unit 60 min 1 h = minute ‘ min ’ means hour ‘ h ’ means

29. Electronic Stopwatch is an instrument which measures ____________. Accuracy = s ‘ Start’ button ‘ Stop’ button

30. Electronic Stopwatch is an instrument which measures ____________. Accuracy = s

31. Pendulum Invented by Ibn Yunus ابن يونس Used by Galileo to measure time

32. Pendulum Clock

34. Pendulum 1 ‘ oscillation’ = 1  2  3  2  1 Period (T) = time taken for 1 oscillation = ‘how fast the pendulum is swinging’

35. Pendulum Average Time taken for 10 oscillation = 10 10 10 Period (T) = time taken for 1 oscillation = Time taken (s) Number of Oscillation

36. Pendulum Theory Workbook p.17 Q 4

37. “ angle of displacement” “ Period” Therefore, the size of the swing doesn’t affect Period.

38. Pendulum 1 ‘ oscillation’ = 1  2  3  2  1 Period (T) = time taken for 1 oscillation = ‘how fast the pendulum is swinging’ Fast or Slow Period (T) 10 s 2 s

39. Pendulum 1 ‘ oscillation’ = 1  2  3  2  1 Period (T) = time taken for 1 oscillation = ‘how fast the pendulum is swinging’ Fast Slow Fast or Slow Period (T) 10 s 2 s

40. Pendulum Clock When the clock is too slow, decrease the Period. When the clock is too fast, increase the Period.

41. Pendulum Clock When the clock is too slow, decrease the Period. When the clock is too fast, increase the Period.

42. Pendulum http://en.wikipedia.org/wiki/Pendulum Period ( = Time taken for 1 oscillation) ( = ‘ how fast is the pendulum swinging ’) Pendulum Length

44. Pendulum http://en.wikipedia.org/wiki/Pendulum Period ( = Time taken for 1 oscillation) ( = ‘ how fast is the pendulum swinging ’) Pendulum Length constant numbers

45. T = l to When l = 10 T = 10 When l = 20 T = 20 Remove constant numbers and simplify T = l When l increases, T also increases. Therefore, Longer l , Longer T .

46. Pendulum http://en.wikipedia.org/wiki/Pendulum Period Pendulum Length Longer Length, Longer Period.

47. Pendulum http://en.wikipedia.org/wiki/Pendulum Period Pendulum Length Bob Mass doesn’t affect Period.

48. Pendulum http://en.wikipedia.org/wiki/Pendulum Period Pendulum Length Swing size doesn’t affect Period. swing size = “angle of displacement”

50. Pendulum Theory Workbook p.18 Q 6

53. Pendulum Clock Longer Length, Longer Period. When the clock is too slow, decrease the Period How? When the clock is too fast, increase the Period. How?

54. Pendulum Clock Longer Length, Longer Period. When the clock is too slow, decrease the Period How? Decrease the Pendulum Length. When the clock is too fast, increase the Period. How? Increase the Pendulum Length.

55. http://en.wikipedia.org/wiki/Pi_(film)

56. Homework Theory Workbook p.18-20 For today’s slides, go to: www.slideshare.net Login: tvos0619 Password: 1234qwer