Download - Bellwork …solve the riddle
![Page 1: Bellwork …solve the riddle](https://reader033.vdocuments.mx/reader033/viewer/2022061602/568164da550346895dd7296f/html5/thumbnails/1.jpg)
Bellwork…solve the riddleA pendulum has it, water rippling on a pond shows
it, “mechanics” can explain it, a truck uses it, an acrobat on the trapeze plays with it, our brains interpret it, a grandfather clock depends on it and a spider feels it.
What is it?
• P.S. If you missed your test yesterday, come see me to set up a time to take it. You may also plan to come in 8th period tomorrow.
• P.P.S We will probably go over the test Friday• P.P.P.S. The answer is not waves
![Page 2: Bellwork …solve the riddle](https://reader033.vdocuments.mx/reader033/viewer/2022061602/568164da550346895dd7296f/html5/thumbnails/2.jpg)
Wave Warm up Wednesday!
I. Waves are produced by oscillating particles.A. Oscillation - move or swing back and forth around a
central pointB. Periodic motion – repeated motion
Ex. Trapeze, swing, wrecking ball, grandfather clock or metronome.C. Simple harmonic motion – vibration about an equilibrium position in which a restoring force is proportional to the displacement from the equilibrium.D. Damping – the tendency of a vibrating object to dissipate its energy over time
![Page 3: Bellwork …solve the riddle](https://reader033.vdocuments.mx/reader033/viewer/2022061602/568164da550346895dd7296f/html5/thumbnails/3.jpg)
II. Waves transfer energy from one location to another without transferring matter.
![Page 4: Bellwork …solve the riddle](https://reader033.vdocuments.mx/reader033/viewer/2022061602/568164da550346895dd7296f/html5/thumbnails/4.jpg)
III. All waves have properties in common, such as wavelength, frequency, and energy transmission.
A. Amplitude – greatest distance from equilibrium point
B. Cycle – one complete ‘to and fro’ motionC. Period – the time required for one
complete cycle (T)D. Frequency – number of complete cycles
per second.
![Page 5: Bellwork …solve the riddle](https://reader033.vdocuments.mx/reader033/viewer/2022061602/568164da550346895dd7296f/html5/thumbnails/5.jpg)
IV. Mechanical waves travel at different speeds in different media and undergo reflection and refraction (bending) at boundaries.
A. Medium/Media – a physical environment through which a disturbance can travel (Ex…)
B. Mechanical wave – a wave that requires a medium through which to travel
![Page 6: Bellwork …solve the riddle](https://reader033.vdocuments.mx/reader033/viewer/2022061602/568164da550346895dd7296f/html5/thumbnails/6.jpg)
V. Waves interact with each other and produce new wave patterns at boundaries. One example would be diffraction.
![Page 7: Bellwork …solve the riddle](https://reader033.vdocuments.mx/reader033/viewer/2022061602/568164da550346895dd7296f/html5/thumbnails/7.jpg)
VI. The properties of waves are used in devices for medical, industrial, scientific, or social purposes.
![Page 8: Bellwork …solve the riddle](https://reader033.vdocuments.mx/reader033/viewer/2022061602/568164da550346895dd7296f/html5/thumbnails/8.jpg)
Shock absorbers
![Page 9: Bellwork …solve the riddle](https://reader033.vdocuments.mx/reader033/viewer/2022061602/568164da550346895dd7296f/html5/thumbnails/9.jpg)
![Page 10: Bellwork …solve the riddle](https://reader033.vdocuments.mx/reader033/viewer/2022061602/568164da550346895dd7296f/html5/thumbnails/10.jpg)
Closure
• Using the example of a bobblehead, explain how amplitude, frequency, and damping relate to its motion
![Page 11: Bellwork …solve the riddle](https://reader033.vdocuments.mx/reader033/viewer/2022061602/568164da550346895dd7296f/html5/thumbnails/11.jpg)
Bellwork
• Draw a wave (like the one below) and label all the parts that you know/remember.
![Page 12: Bellwork …solve the riddle](https://reader033.vdocuments.mx/reader033/viewer/2022061602/568164da550346895dd7296f/html5/thumbnails/12.jpg)
• Wavelength – where do you measure from? • The shortest distance between equivalent points on
a continuous wave.• = lambda = wavelength
![Page 13: Bellwork …solve the riddle](https://reader033.vdocuments.mx/reader033/viewer/2022061602/568164da550346895dd7296f/html5/thumbnails/13.jpg)
Wave types and measurements
I. Wave typesA. pulse wave –single traveling pulseB. periodic wave – involves _____ motionC. Sine waves
1. describe particles vibrating with simple harmonic motion
2. special case of a periodic wave3. called a sine wave because y= sin x
![Page 14: Bellwork …solve the riddle](https://reader033.vdocuments.mx/reader033/viewer/2022061602/568164da550346895dd7296f/html5/thumbnails/14.jpg)
• D. Standing wave
![Page 15: Bellwork …solve the riddle](https://reader033.vdocuments.mx/reader033/viewer/2022061602/568164da550346895dd7296f/html5/thumbnails/15.jpg)
E. transverse waveex. Electromagnetic waves
F. longitudinal wave1. Sound waves2. compression3. rarefaction
![Page 16: Bellwork …solve the riddle](https://reader033.vdocuments.mx/reader033/viewer/2022061602/568164da550346895dd7296f/html5/thumbnails/16.jpg)
![Page 17: Bellwork …solve the riddle](https://reader033.vdocuments.mx/reader033/viewer/2022061602/568164da550346895dd7296f/html5/thumbnails/17.jpg)
II. Wave measurementsA. amplitudegreater the amplitude = more energy B. wavelengthC. Period, Frequency and Wave speed1. v = f • λ 2. Speed of a mechanical wave is constant for
any given medium3. Speed only changes when the wave moves
from one medium to another or certain properties of the medium are varied (such as temperature)
4. unit for frequency = Hertz (Hz)
![Page 18: Bellwork …solve the riddle](https://reader033.vdocuments.mx/reader033/viewer/2022061602/568164da550346895dd7296f/html5/thumbnails/18.jpg)
Olive Udadi accompanies her father to the park for an afternoon of fun. While there, she hops on the swing and begins a motion characterized by a complete back-and-forth cycle every 2 seconds. The frequency of swing is _________.
![Page 19: Bellwork …solve the riddle](https://reader033.vdocuments.mx/reader033/viewer/2022061602/568164da550346895dd7296f/html5/thumbnails/19.jpg)
A piano string tuned to middle C vibrates with a frequency of 262 Hz. Assuming the speed of sound in air is 343 m/s, find the wavelength of the sound waves produced by the string.
![Page 20: Bellwork …solve the riddle](https://reader033.vdocuments.mx/reader033/viewer/2022061602/568164da550346895dd7296f/html5/thumbnails/20.jpg)
• A tuning fork produces a sound with a frequency of 256Hz and a wavelength in air of 1.35m– A. what value does this give for the speed of
sound in air?– B. What would be the wavelength of this same
sound in water in which sound travels at 1500m/s
![Page 21: Bellwork …solve the riddle](https://reader033.vdocuments.mx/reader033/viewer/2022061602/568164da550346895dd7296f/html5/thumbnails/21.jpg)