DAY 137
Goals:
1. Retake Quiz 6 and pass the quiz with a score of 100%
2. Build mastery by answering machine-related questions, and solving machine-related problems
Warm-Up:
1. none
Classwork:
1. Exam Prep
Your Machines Exam is scheduled for Friday. To prepare for the exam, review the following:
Video Info: https://www.youtube.com/watch?v=KrYEyPX7Ssg&feature=youtu.be
- vocabulary listed on page 277, section 10.2. LINK
- each of the six simple machines and three classes of levers
https://sites.google.com/site/mralexandersscienceweb/physics/daily-agenda-classwork/day-121
- conceptual questions
page 273 29-33
https://www.slader.com/textbook/9780078458132-physics-principles-and-problems/273/
page 278 48, 49, 51 (this page LINK may be helpful with answering these questions)
https://www.slader.com/textbook/9780078458132-physics-principles-and-problems/278/
- practice problems
page 272 24-28
I went over some of these here on Day 131: https://drive.google.com/file/d/1imTewCbSLfXv70kHxgV6Vdf3y1P6kfa7/view
The rest are answered here: https://www.slader.com/textbook/9780078458132-physics-principles-and-problems/272/
page 280 79-80
https://www.slader.com/textbook/9780078458132-physics-principles-and-problems/280/
How was your spring break? Good! Glad to hear it.
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
1. 137A: 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 a table neighbor:
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.
In this example, we can see that speed is not affected by an increase in wavelength, as a corresponding 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...
OR
in equation form, this looks like v = λ • f
2. #137B: 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
3. CAASPP Testing Tuesday, Period 1-3
If you aren't and 11th grader testing, you'll head to room 142. Assignment is a pre-lab prep for Wednesday's wave interference lab.
HOMEWORK
Complete 137B
Complete Extra Credit