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# Ch 12.2 Waves in Motion ppt

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Types of waves
Types of wave interactions

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### Ch 12.2 Waves in Motion ppt

1. 1. Integrated Science Unit 4, Chapter 12
2. 2. 12.1 Two Types of Waves:A transverse wave has its oscillations perpendicular to the direction the wave moves.A longitudinal wave has its oscillations in the same direction as the wave moves.
3. 3. Longitudinal WaveThe wave we see here is a longitudinal wave.The medium particles vibrate parallel to the motion of the pulse.This is the same type of wave that we use to transfer sound. show tuning fork demo 4
4. 4. Transverse WavesThe difference between the two types: 5
5. 5. 12.1 Frequency, Amplitude and Wavelength
6. 6. 12.2 Graphs of Harmonic MotionKey Question:How do waves move and interact with things?
7. 7. *Wave Shapes *PlaneWaves- a wave that has crests all in a straight line.
8. 8. *Wave Shapes *CircularWaves- a wave that has circular wave fronts that move outward from the center.
9. 9. Plane Waves
10. 10. Circular Waves
11. 11. *What happens when a wave hits anobstacle? *Reflection *Refraction *Diffraction *Absorption
12. 12. REFLECTION
13. 13. REFRACTION
14. 14. DIFFRACTION
15. 15. ABSORPTION
16. 16. Wave InteractionAll we have left to discover is how waves interact with each other.*When two waves meet while traveling along the same medium it is called INTERFERENCE. 21
17. 17. Constructive InterferenceLet’s consider two waves moving towards each other, both having a positive upward amplitude.What will happen when they meet? 22
18. 18. *Constructive Interference*They will ADD together to produce a greater amplitude.This is known as CONSTRUCTIVE INTERFERENCE. 23
19. 19. Destructive InterferenceNow let’s consider the opposite, two waves moving towards each other, one having a positive (upward) and one a negative (downward) amplitude.What will happen when they meet? 24
20. 20. *Destructive Interference*This time when they add together they will produce a smaller amplitude.This is know as DESTRUCTIVE INTERFERENCE. 25
21. 21. Wave Interference 26
22. 22. Check Your Understanding Which points will produce constructive interference and which will produce destructive interference?  Constructive G, J, M, N  Destructive H, I, K, L, O 27
23. 23. Your Turn: Create a graphic organizer using the following terms:1. Reflection2. Refraction3. Diffraction4. Absorption Explain what the term means. (use your own words) Draw a picture to represent what happens. List Examples
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