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Waves

Waves. Boat stuck in the middle of a pond A toy boat is stuck in the middle of a pond. How can Bob retrieve the boat without entering the water?. Boat stuck in the middle of a pond A toy boat is stuck in the middle of a pond. How can Bob retrieve the boat without entering the water?.

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Waves

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  1. Waves

  2. Boat stuck in the middle of a pond A toy boat is stuck in the middle of a pond. How can Bob retrieve the boat without entering the water?

  3. Boat stuck in the middle of a pond A toy boat is stuck in the middle of a pond. How can Bob retrieve the boat without entering the water?

  4. As the rock comes in contact with the water it exerts a force. In which direction is the force? What is the result of this force?

  5. As the rock comes in contact with the water it exerts a force. In which direction is the force? What is the result of this force?

  6. What happens to the water? Where does the water go?

  7. In order to move the boat forward, in which direction does there need to be a force?

  8. In order to move the boat forward, in which direction does there need to be a force? What is the source of the force? In which direction is the force pushing on the boat?

  9. So what is a wave? Any disturbance that transmits energy through matter or empty space It’s the vibration of a particle Wave Motion Transverse Wave

  10. Wavelength λ Crest Amplitude Resting Point Transverse wave Trough

  11. So what is a wave? Any disturbance that transmits energy through matter or empty space It’s the vibration of a particle Wave Motion Transverse Wave Longitudinal Wave

  12. Wavelength λ Compressions Rarefactions Longitudinal Wave

  13. How Waves Travel

  14. Wavelength λ Amplitude

  15. Bob watches the waves as they move under the dock.

  16. He counts them as they pass. He counts 10 waves in 5 seconds. How often do the waves pass under the dock? What is the frequency of the waves? 10 waves per 5 second or 2 waves per second 1,2,3

  17. Now he counts 15 waves in 5 seconds. How often do the waves pass under the dock? What is the frequency of the waves? 15 waves per 5 seconds or 3 waves per second 1,2,3

  18. Frequency is the number of waves per second. 6 waves In 1 second 6 w/ 1 s 1 second of time 6 w/s = frequency

  19. Frequency is the number of waves per second. 4.5 waves In 1 second 4.5 w/ 1 s 1 second of time 4.5 w/s = frequency

  20. What if the wavelength changes? 12 waves In 1 second 12w/ 1 s 1 second of time 12 w/s = frequency If decrease the wavelength, you increase frequency.

  21. What if the wavelength changes? 4.5 waves In 1 second 4.5w/ 1 s 1 second of time 4.5 w/s = frequency If you increase the wavelength, you decrease the frequency

  22. What if the waves are moving faster? The waves are the same, they are just moving faster. 1,2,3

  23. What if the wave speed changes? 12 waves In 2 second 6w/ 1 s 2 seconds of time 6 w/s = frequency

  24. Wave speed is frequency times wavelength S = f · λ

  25. How do waves move? Imagine a vibrating particle……

  26. How do waves move? Imagine a vibrating particle…… It collides with another particle

  27. The energy from the first particle is passed to the second and the second moves.

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