2. Mr. Z’s “Waves” Unit

3. Mr. Z about to catch some “Air”

4. Mr. Z’s “Riding One Home!”

8. Identify the features of a wave AIMAIM: What are features of waves?

9. Amplitude, frequency, hertz, wavelength, wave speed AIM:AIM: What are features of waves?

10. What is a wave? An energy disturbance traveling place to place What are the two types of waves we are studying Transverse and longitudinal, AIM: What are features of waves?

11. The two types of mechanical waves: Transverse Longitudinal AIM: What are features of waves?

12. TRANSVERSE WAVES EXAMPLE: “waves made with the rope” EXAMPLE: “water waves”

13. TRANSVERSE WAVES The particles of the medium typically move perpendicular to the movement of the wave!

14. TRANSVERSE WAVES The particles of the medium typically move perpendicular to the movement of the wave!

15. LONGITUDINAL WAVES The particles of the medium typically move parallel to the movement of the wave!

16. Draw a transverse wave on the board Identify CRESTS and TROUGHS 15-1 Transparency 57: Transverse Wave AIM: What are features of waves?

17. Draw and label crest and trough. AIM: What are features of waves?

18. Draw and label the crest and trough AIM: What are features of waves?

19. The highest point of the wave? the crest. lowest point is called ? the trough. AIM: What are features of waves?

20. Waves can be characterized in terms of three basic features 1. Amplitude 2. Wavelength 3. Frequency

21. Height of the wave. Distance between the the crest and the “normal” position

22. Draw three waves: The first will have a 1 cm amplitude, the second will have a 2 cm amplitude, and the third will have an amplitude of 3 cm.

24. Draw and label the crest and trough and amplitude.. AIM: What are features of waves?

25. Draw and label the crest and trough and amplitude.. AIM: What are features of waves? Amplitude

26. Draw and label the crest and trough and amplitude.. AIM: What are features of waves? Amplitude

27. Draw and label the crest and trough and amplitude.. AIM: What are features of waves? Amplitude

28. Are all the Amplitudes on the same wave identical? YES THEY HAVE TO BE! AIM: What are features of waves? Amplitude

29. AIM: What are features of waves? wavelength

30. The distance between the crest of one wave and the crest of the next wave. AIM: What are features of waves?

31. The distance between the trough of one wave and the trough of the next wave. How else could you define wavelength? AIM: What are features of waves?

32. Draw and label the wavelength, crest and trough. AIM: What are features of waves?

33. Draw and label the wavelength, crest and trough AIM: What are features of waves? wavelength

34. Draw and label the wavelength, crest and trough AIM: What are features of waves? wavelength

35. Are both wavelengths the same ? Yes! All wavelengths on the same wave are the same length wavelength

36. AIM: What are features of waves?

37. Crest Trough AIM: What are features of waves? Label the Crest, Trough, Amplitude, rest position, & wavelength of this transverse wave

38. Crest Trough AIM: What are features of waves? Label the Crest, Trough, Amplitude, rest position, & wavelength of this transverse wave

39. Crest Trough Label the Crest, Trough, Amplitude, rest position, & wavelength of this transverse wave

40. Crest Trough Label the Crest, Trough, Amplitude, rest position, & wavelength of this transverse wave

41. Crest Trough Label the Crest, Trough, Amplitude, rest position, & wavelength of this transverse wave

42. AIM: What are features of waves?

44. QUICK REVIEW: Longitudinal Wave Where are the compressions ?

45. QUICK REVIEW of Longitudinal Wave Where are the rarefactions ?

46. What is the wavelength of this Longitudinal Wave?

47. The number of “compete wave cycles” that pass a certain point in a given amount of time. Usually measured in the number of complete waves per second AIM: What are features of waves?

48. Don’t confuse wavelength with a complete wave cycle !!!!!!! Definition: The number of complete wave cycles that pass a given point in one second is the wave's frequency.

49. “What is a complete wave cycle?”

50. A complete wave cycle is measured as “from one crest (or trough) to the next” AND Crest

51. How many of those cycles pass by in a one second interval of time

52. Frequency is measured in “HERTZ” Definition of Hertz: unit used to measure the frequency of a wave a measure of the number of complete waves per second What does 15,000 hertz mean?

53. All waves move at a specific speed. The speed of a wave = (frequency) x (wavelength) AIM: What are features of waves?

54. The speed of wave measures how many meters it travels per second The hertz (frequency) of a wave measure how many waves (or crests) there are each second

56. http://id.mind.net/~zona/mstm/p hysics/waves/partsOfAWave/wav eParts.htm#frequency

58. REVIEW

60. Class Activity: W/S Concepts 7-3 PH 15-2 AIM: What are features of waves?

61. Homework: INTERNET QUESTIONS