Playing PhysicsInterrobang

Waves

1. lllustrate the Physics Principles regarding Wavesdescribed on the next slides.

2. Create live physical demonstrations unless otherwise directed in the instructions.

3. Where applicable, submit the MS Excel and PowerPoint files with your team members names and “InterroWaves” in the file name.

Waves - Principles to Illustrate

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1) Use Microsoft Excel to make a table with data and its corresponding graph to show that sine waves are produced from the trigonometric function y = sin x. You must use the sine function in Excel to create the data table and graph.

2) Use Microsoft PowerPoint to make an original (not copied from web or other student) animation showing a sine wave moving through one period and simultaneously:

• its twin wave moving through the same period rotating counter clock-wise through a circle

• its twin spring-mass system traveling through the same period

• its twin pendulum traveling through the same period.

Label the Period, Amplitude and degrees of rotation.

Example: http://s306.photobucket.com/user/quantum_flux/media/Animations/Math%20Concepts/SimHarMotion-1.gif.html

Waves - Principles to Illustrate

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3) Demonstrate two mechanical waves (these need a medium to travel through) -a Longitudinal Wave and a Transverse Wave in class. Show the amplitude, crest and trough of each. Show how they can both be graphed to look like a sine wave.

4) Show how to determine one of the variables of speed, frequency and wavelength if the other two are known. Use two real-life examples (e.g. tsunami, earthquake S-wave, guitar string).

5) Show, using photographs or videos of real life examples, that the speed of a wave changes only when the wave moves from one medium to another or when the medium's temperature changes.

6) Explain how when playing a stringed instrument such as a guitar, how you could perturb the same string twice, the second time creating more than 10 times the power as the first. Show which variables in the “Power transmitted by string wave” equation you changed in your second perturbation of the string to transmit more than 10X power down the string.

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7) Demonstrate the super position principle (when two or more waves travel through a medium at the same time, the resultant wave is the sum of the displacements of the individual waves at each point) for pulse waves. Make a skit, create an animation, or demonstrate using mechanical pulse waves.

8) Demonstrate wave interference patterns (constructive and destructive) using either light or water as the medium for your waves. Build a double-slit demonstration. (see: https://www.youtube.com/watch?v=Pk6s2OlKzKQ and https://www.youtube.com/watch?v=GDwRvv5NZLA and https://www.youtube.com/watch?v=Iuv6hY6zsd0 and https://www.youtube.com/watch?v=kKdaRJ3vAmA and https://www.youtube.com/watch?v=MDX3qb_BMs4 and

9) Demonstrate reflection of a pulse wave at two kinds of boundaries - free and fixed boundaries. Compare and contrast the behavior of the reflected waves. Use string for the pulse wave. Look for itemsin the classroom to use as the boundaries.

Waves - Principles to Illustrate

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10) Demonstrate at least two different standing waves using the same physical object such as a cotton string, guitar string, Slinky, belt, etc.

Show the amplitude, the wavelength, the period, the frequency, the node(s) and anti-node(s). Explain why standing waves are actually traveling waves.

The more uncommon the object used to demonstrate the standing waves, the better.

Waves - Principles to Illustrate

GradingInterrobang Waves comprises two Daily Grades and one Minor Grade

Daily grade for items 1 - 2Daily grade for items 3 - 6Minor grade for items 7 – 10

All team members inherit the same score. But bonus points for extra-ordinarycontributions by specific team members.

Illustrations are correct, clear and complete: 80 - 89 class scoreIllustrations also demonstrate creativity and quality: 90 – 100

1. Illustrations must be clearly labeled and explained with the name of the physics principles, the appropriate equation(s) and the correct calculations.

Teams1) Pick your own teams. Each team must be 2 - 3 members.

2) Presentations should be 10 - 15 minutes.

3) Every team member must contribute to the creation and presentation of the team’s final product.

Waves - Good reference sites

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http://www.physics.uci.edu/~demos/images/Demos/3a40.10.gif

http://www.acs.psu.edu/drussell/Demos/superposition/superposition.html

http://www.acs.psu.edu/drussell/Demos/SWR/SWR.html

http://www.physics.arizona.edu/~hoffman/ua200/Oscillations_Waves.html

Pendulum Wave Effect:

https://www.youtube.com/watch?v=7_AiV12XBbI

https://www.youtube.com/watch?v=YhMiuzyU1ag