DAY 64

THIS IS VERY COOL ---> A team of three students from Venice High School earned 1st place in the Chevron Design Challenge, Los Angeles Regional Competition at Da Vinci Schools. The three students are Alexander Sernas Lopez, Anton Truskovskiy, and Angela Yang. These students worked together to solve an engineering design problem and created a 3D model of their solution. They presented to a panel of 3 engineers. GOOD JOB!

WARM-UP

Explain the errors made by the students:

Josie: “The wavelength is the distance measured horizontally from crest to trough.”
Billie: “The amplitude is the distance measured vertically from crest to trough.”
Janice: “The picture below shows one period.”

CLASSWORK

HW Review

064A: Notes: The Wave Equation

Recall that the speed of an object refers to how fast an object is moving (distance per time)
In equation form:

If the crest of an ocean wave moves a distance of 20 m in 10 sec, then the speed of the ocean wave is ________________ .
If the crest moves a distance of 25 m in 10 sec, then the speed of the wave is _______________ .
- Therefore, the faster wave travels a greater distance in the same amount of time.

Solve with your partner:

Noah stands 170 m away from a steep canyon wall. He shouts and hears the echo of his voice one second later. Sketch a diagram of this scenario. What is the speed of the wave?

Analyze this simulated data for the speed of a wave: What variable seems to most affect the speed of the wave?

ANSWER: _________ in the spring was the obvious variable that altered the speed of the wave.

Therefore: the materials that the wave is made of (depending on it’s density, temperature, elasticity, etc.) affects the speed of the wave.

DEMO

In this example, we can see that speed is not affected by an increase in wavelength, as acorresponding decrease in frequency occurs. Speed is not affected by amplitude either.

Since a wave covers the distance (called the “wavelength”) in an amount of time (called the “period”), the speed equation can be adjusted to use wave-related terminology:

instead of speed = distance/time, we now have...

in equation form, this looks like v = λ • f

#064B: Wave Speed Skill Builder

Here comes the math! :) Solve 1-12. We will do #1 and part of #3 together. But first, what does PSYW mean?

Skill Builder LINK

HOMEWORK

Complete 064B

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