Today is the last day in our Rube Goldberg Machine project. By the end of the day, you should have uploaded a video or shared a YouTube link to assignment 118A, and uploaded your paper to assignment 118B. Any questions, Remind App or email. For the rest of the week, we'll wrap up the unit on Simple Machines with the concept of Mechanical Advantage. If you'd like to read up on that, pages 266-268 in your book are a good start. Link to that is here: https://archive.org/stream/PhysicsPrinciplesAndProblemsByAGlencoeProgram/Physics%20Principles%20and%20Problems%20By%20A%20Glencoe%20Program#page/n279/mode/2up
Best,
Mr. A
Essential Question: How can energy be transferred?
GOALS: SWBAT...
1. define compound machines
2. build functional machines
3. describe how energy is transferred
WARM-UP 129
1. What is a Compound Machine? Define the term, then list two compound machines you've used in your life, and what simple machines they contain.
2. Project Checklist
Which of the following do you still need to complete?
a. design
b. design approval from Mr. Alexander
c. materials collection
d. machine building
e. video of machine
f. video submission via schoology (assignment 118A)
g. paper written and submitted (assignment 118B)
If you need help with any of the above, message me via Remind App or via email josh.alexander@lausd.net
CLASSWORK
1. Rube Goldberg Paper
Paper examples:
I've included a few graded examples of papers. Use them as examples and/or templates. Remind message or email with any questions. LINK: https://docs.google.com/document/d/1eWlQgicowoW-MBX8Mi91BBVT_xPQSCfuSFfAqazGNww/edit?usp=sharing
- Mr. A
From your project guidelines: https://docs.google.com/document/d/1NbvMBgjdU3HvjqoQVbV1dkhuEKZ3p5VnwZiVpAGwsKo/edit
Project Paper:
You will write a project paper that explains each step and each energy exchange. For example, this is an explanation of one energy exchange:
“The dominos are started on one side and each falls into the next. The Potential Energy of each domino drops as it falls and its Kinetic Energy rises. The final domino hits a marble so it does work on the marble to increase its Kinetic Energy. I chose this energy transfer because it showed both PEg and KE, and because it was reliable and repeatable. It worked every time.”
Your paper should include why you constructed each energy transfer the way you did and describe the materials you chose. For example, let’s say you needed to raise a marble so it could gain more energy. You might use a pulley system, and state, “I used a pulley with string and two cups to increase the height of a marble. Increasing the height meant the marble would have more potential energy, and therefore have energy to continue moving components in the machine”
2. Machine building
3. Thermodynamics Exam & Simple Machines Quiz
- make sure you've completed both. Assignments are on schoology
Essential Questions:What is a wave? How do they act? How do waves differ?
Goals: SWBAT...
1. Discuss waves’ properties using common vocabulary and they will be able to predict the behavior of waves through varying medium and at reflective endpoints
Warm-Up (5min):
1. When you increase the amplitude of a wave, what happens to each of the following characteristics?
a. Height
b. number of waves per second (frequency)
c. Pattern (does the wave stay constant, or is it changing?)
d. Wavelength
CLASSWORK
1. #129A: Waves on a String
Directions:
1. Open Waves on a String: https://phet.colorado.edu/en/simulation/wave-on-a-string
2. With the Oscillate button on and with No End checked, investigate waves more carefully using the Amplitude slider.
Write answers to the following after your group has talked about each and agreed.
a) Define Amplitude in everyday language.
b) Explain how the wave behaves as the Amplitude changes using the characteristics you described in the warm-up
c) Use a rope/string/ on the floor for some investigations and explain how you could change the Amplitude of a wave.
3. Repeat step number 2, for Frequency, Tension and Damping.
4. Set Amplitude on high, Frequency to .25Hz, Damping on none, and Tension on low. Also, have on Oscillate, Timer and No End. Use the Pause button to freeze the wave.
a) Place a blank piece of paper on your monitor and trace the wave and the wave generator. Mark the green balls. This is a vertical position- horizontal position graph, label your axes.
b) Quickly press Play, and then Pause again. Use the same piece of paper, put it on the monitor and make sure to get the generator in the same spot. Trace the new wave.
c) Write about the differences and similarities in the characteristics. You may have to do some more tests by pressing Play, then Pause and tracing to test your ideas.
5. Same settings as above in #4. Set Amplitude on high, Frequency to .25Hz, Damping on none, and Tension on low. Also, have on Oscillate, Timer and No End. Use the Pause button to freeze the wave.
a) Measure the vertical location of a green ball with a ruler. B) Record the vertical position and time.
b) Quickly press Play, then Pause repeatedly to make a data table the vertical position of the green ball versus time.
c) Make a graph of vertical position versus time.
d) Write about the differences and similarities between vertical position- horizontal position graphs and vertical
position-time graphs.
6. Investigate how waves behave when the string end is Fixed and Loose with Manual settings. Discuss the behavior with your partners, or think about it on your own. Test your ideas and the write a summary.
7. Read to find out what a standing wave is, investigate how to produce one with the simulation and write a procedure that another student could follow to produce a standing wave. Links on standing waves are immediately below:
http://www.physicsclassroom.com/class/waves/Lesson-4/Traveling-Waves-vs-Standing-Waves
http://www.physicsclassroom.com/class/waves/Lesson-4/Formation-of-Standing-Waves
At Home Learning (HW)
1. Complete #129A. If you were on point in class today, you'll only have part 6 and 7 to complete at home.