DAY 153

Today's Lecture Video --> https://youtu.be/1rPdyOMkYMA

GOALS: swbat...

1. draw wave patterns for objects moving at a variety of speeds

2. explain the cause of a sonic boom

3. begin exploring non-mechanical waves (Electro-Magnetic Waves)

WARM-UP

Word Bank for #1: observer, generator, wavelength, amplitude, frequency, damping, period

1. The pitch of a sound depends on the ______________ of the sound waves that reach the _____________. 

2. In each case, tell whether the pitch rises or drops: 

a. The source of a sound moves away from the observer, who stands still. _____ 

b. The source stays still and the observer moves toward the source. ______ 

c. The source and observer move toward each other. ___________ 

d. The source stays still, and the observer moves away. ___________

CLASSWORK

1. 153A: More Doppler Effect

    1. All the cases above are examples of the ____________ Effect. 

    2. Give 3+ uses of the Doppler Effect. Look up examples on the internet if you need ideas

    3. Draw 4 circles representing water wave fronts made by a boat (use a dot for the boat) moving from left to right in each situation:

        A. Boat moves slower than waves move. 

        B. Boat moves at the same speed as waves move. 

        C. Boat moves faster than waves move.

answers to the above can be found here (LINK) by hovering over or clicking blue areas. 

2. 153B: Sonic Boom

    1. Answer a few questions (see below) in your notes while you watch a 3 min video on sonic booms by Mr. Alexander's favorite aviation channel, AvWeb. https://www.youtube.com/watch?v=gWGLAAYdbbc

        a. The second "unusual visual effect" shown is via a black and white photo of a SR-71 Blackbird jet. The plane changes the __________ in the air as it moves through the air, bending ______ like a _____.

        b. Give a few examples of a lens which bends light:

        c. Where do you see the difference in density bending light in the photo of the Blue Angels #5 F/A-18 Hornet?

        d. In the last video clip of the Atlas rocket, what did the rocket's movement through air at high speed cause? 

More on sonic booms: https://en.wikipedia.org/wiki/Sonic_boom (I suggest reading the first four paragraphs. Gets a bit complex after that)

3. 153C: Introduction to Non-Mechanical Waves (Electromagnetic Waves)

    It's time to transition from something we can see (mechanical waves) to something we can only see the effect of (electromagnetic waves). We'll start off with some reading to build your vocabulary, and your conceptual knowledge.

    1. The guided reading handout in on Schoology. Should you be unable to access Schoology, please let me know so I can help you gain access, and in the interim use this link: LINK

    2. The reading is from a copy of a conceptual physics book, available here: LINK

4. Tomorrow you'll have time to complete the guided reading, and take a quiz on mechanical/sound waves

Weather Radar: https://www.weather.gov/jetstream/how

Police Radar Gun: https://www.thoughtco.com/how-does-doppler-radar-work-2699232

Halley's Comet: https://en.wikipedia.org/wiki/Halley%27s_Comet

https://www.gpb.org/files/pdfs/gpbclassroom/physics/dopplerSonicBoomWkst.pdf

Goal: 

SWBAT 

1. Define Refraction

WARM-UP

1. Describe the straw's appearance.

2. Why does the straw appear split?

https://i1.wp.com/reekoscience.com/main/wp-content/uploads/2014/03/image114.png

CLASSWORK

153A: Refraction

Slideshow: LINK

HOMEWORK

Complete 153B & C