Waves. Anatomy of a Wave Wave Speed Adding waves Natural Frequency Resonance
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1 Waves Anatomy of a Wave Wave Speed Adding waves Natural Frequency Resonance
2 Anatomy of a wave
3 wavelength wavelength Wavelength is denoted by l
4 Is this a wavelength (l)? A: Yes B: No
5 Is this a wavelength (l)? A: Yes B: No
6 Amplitude (A) Height/depth of crests/troughs Sailors care about wave height not amplitude! Frequency (f) Rate of the oscillation
7 Which wave represents a smaller amplitude than the wave shown? A B C D
8 Which wave represents a smaller amplitude than the wave shown? A B C D
9 Which wave represents a smaller frequency than the wave shown? A B C D
10 Which wave represents a smaller frequency than the wave shown? A B C D
11 Amplitude (A) m (meters) Frequency (f) Number of oscillations per second 1/s or Hz (hertz) Frequency of the above wave is A. ½ Hz B. 1 Hz C. 2 Hz D. Not enough Information 1 second
12 Amplitude (A) m (meters) Frequency (f) Number of oscillations per second 1/s or Hz (hertz) Frequency of the above wave is A. ½ Hz B. 1 Hz C. 2 Hz D. Not enough Information 1 second
13 Amplitude (A) m (meters) Frequency (f) Number of oscillations per second 1/s or Hz (hertz) 2 Hz Period (T) Time for one oscillation The period of the above wave is A. ½ s B. 1 s C. 2 s D. Not enough information
14 Amplitude (A) m (meters) Frequency (f) Number of oscillations per second 1/s or Hz (hertz) 2 Hz Period (T) Time for one oscillation The period of the above wave is A. ½ s B. 1 s C. 2 s D. Not enough information 1 oscillation (l) 0.5 s
15 Wave Speed Wave on a String Homework: Does the speed of the wave depend on Amplitude? A Yes, B No Frequency? A Yes, B No Damping? A Yes, B No Tension? A Yes, B No
16 Imagine a concert What if wave speed depended on frequency? -high notes would arrive before low notes -or vice versa What if wave speed depended on amplitude? -louder notes would arrive before quieter notes -or vice versa What if wave speed depended on tension? -That s how you tune stringed instruments
17 Wave Speed Wave on a String Homework: Does the speed of the wave depend on Amplitude? A Yes, B No Frequency? A Yes, B No Damping? A Yes, B No Tension? A Yes, B No Have to change the characteristics of the string
18 Types of Waves Transverse Waves Longitudinal Waves Transverse, Longitudinal, and Periodic Waves
19 Source, Receiver & Medium People Wave What is the Source? first person What is the Receiver? last person What is the Medium? all the people
20 Source, Receiver & Medium Wave on a String What is the Source? Orange Pump What is the Receiver? Clamp What is the Medium? The string of red beads
21 Source, Receiver & Medium Longitudinal slinky wave What is the Source? start of slinky What is the Receiver? start of slinky What is the Medium? The slinky
22 How do waves add?
23 Interference of Waves Superposition Principle When two or more traveling waves encounter each other while moving through a medium, the resultant wave is found by adding together the displacements of the individual waves point by point. Constructive Interference Destructive Interference Transverse, Longitudinal, and Periodic Waves
24 Sketch what you think the pattern will look like
25 Wave on a String
26 Natural Frequency The frequency at which an object likes to vibrate
27 Resonance When one object is vibrating and it is put in contact with another object, if the frequency of the first object is at the natural frequency for the second object, the second object will start vibrating vigorously at its natural frequency. (pasta demo is an nice clean example of resonance Or two tuning forks )
28 Tuning Fork example If one tuning fork causes another to resonate, A. both forks must be the same frequency B. The forks can be any frequencies C. The forks have to be the same note.
29 Tuning Fork example If one tuning fork causes another to resonate, A. both forks must be the same frequency B. The forks can be any frequencies C. The forks have to be the same note.
30 Resonance When one object is vibrating and it is put in contact with another object, if the frequency of the first object is at the natural frequency for the second object, the second object will start vibrating vigorously at its natural frequency. (pasta demo is an nice clean example of resonance Or two tuning forks of the same frequency)
31 Tuning Fork example When one object is vibrating and it is put in contact with another object If the vibrating tuning fork #1 is held near but not touching the quiet fork #2 and causes fork #2 to begin vibrating, A. Fork #1 is resonating with Fork #2 B. Technically #1 vibrates the air which in turn resonates with tuning fork #2. C. The tuning forks must be in contact for one to cause the other to vibrate. D. Other
32 Tuning Fork example When one object is vibrating and it is put in contact with another object If the vibrating tuning fork #1 is held near but not touching the quiet fork #2 and causes fork #2 to begin vibrating, A. Fork #1 is resonating with Fork #2 B. Technically #1 vibrates the air which in turn resonates with tuning fork #2. C. The tuning forks must be in contact for one to cause the other to vibrate. D. Other
33 Resonance Swinging In terms of energy, generate an explanation of why Dad s timing has to be just right for the Amplitude to increase.
34 Resonance Swinging The swing has a natural frequency that is determined by its length. If the swing is given a small push at the right time in each cycle, its amplitude gradually increases. This is an example of resonance. The swing receives a small amount of energy during each push, but provided this amount is larger than the energy lost during each cycle (due to friction and air drag), the amplitude of swing increases.
35 Resonance Pasta/raisin demonstration When a driving frequency causes an object to vibrate at its natural frequency.
36 Resonance When a driving frequency causes an object to vibrate at its natural frequency. Wave on a String (A=3, f=50, Damp = 0, Tension = high)
37 Resonance When a driving frequency causes an object to vibrate at its natural frequency. Tall vs. Short Building damage
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