Continue to work on problem solving for momentum in one dimension.
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Momentum Unit Test on Tuesday, March 3.
Starting Wednesday: Torque and Rotational Motion!
2/27 PotU: Momentum practice and first mousetrap car build day
Warm up
What are the two things needed for an object to have momentum?
Answer: Mass and speed.
Classwork
- Complete the back side of the Momentum notes & practice worksheet. This is due before you leave.
- Start building your car: Follow the Lab: Mouse Trap Cars packet.
- Get a stamp on the middle of Page 3 before you begin building.
- Goal for today is
- get your lever arms attached to your mousetrap
- mousetrap attached to your car, and
- your non-powered wheels attached to the car.
Homework
Complete Page 4: Newton’s 1st Law question.
Resources
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2/26 PotU Honors: Physics Photo Project
Spring 3rd quarter honors project
Honors students will need to take a photo of a physics phenomena and describe the physics principles demonstrated by the photo.
Due date
Photos and essays must be submitted electronically to your teacher by 11:59pm, Wednesday March 11th.
Grading
Emphasis is on the composition of your photo and the accuracy of your physics explanation. 60% of your grade will be based on how well your photo captures a physics phenomena, and 40% of your grade will based on the quality and accuracy of your essay.
Guidelines
Photos
There are two categories of photos. Your can decide which category you enter.
(1) Natural photos are those that involve everyday situations that may demonstrate a variety of physics concepts.
(2) Contrived photos are those that are set up to show a particular physics concept or related set of concepts.
You can see past year’s top national photos here.
Original photos may be cropped for better composition (as long as the final product is still an 8” x 10” or 8½” x 11” print). Minimal manipulation of digital images with the intention of accurately rendering the subject is acceptable e.g.: small adjustments to brightness, color, color balance and/or sharpness, is acceptable. This is not a contest to see how well you can manipulate photos; emphasis is on the composition of your photo and the accuracy of your physics explanation.
All photos must be taken with a digital camera, and the original image must be emailed to your teacher. In order to avoid plagiarism, you must also submit an additional photo ‘selfie’ showing you in the photo (take this right before or after you take your contest photo).
- Mr. Trampleasure: ltrampleasure@travisusd.org
Essay Description
Each photo must include a brief essay of 250 words or less describing the physics in the photo.
Essays will be submitted to TurnItIn.com to check for plagiarism.
- turnitin.com (log in with your existing school account: See me for help if you have trouble loging in)
- Class ID: 24169038
- Enrollment key: HonorsS2
National Competition
The top 15 student photos will be entered in the American Association of Physics Teachers National Photo Contest (we can only submit 15 per school).
Of the 15 selected, 10 photos/essays will be chosen by teachers, and 5 will be through a student vote.
2/26 PotU: Momentum!
Warm up
In your own words, define the word momentum. Next, give an example of two objects where one has more momentum than the other.
Today you will be learning about momentum. Most people have a natural grasp of what momentum means…so remember that as we begin our study. You may have some mistakes in your knowledge, and you may not know the math formula, but I bet you could describe two things that have different momenta (the plural of momentum is momenta).
Class work
- Complete the warm up.
- While watching the videos, take notes on the handout. The teacher can pause it if you need it (handout is at the bottom for students who are not in class today).
- Read pages 374-377 in the textbook. Answer the questions on the handout as you read.
- Complete the practice problems.
Video 1
Watch the first 3:41 minutes of this video.
Video 2
Play this video all the way through.
Book reading
Read pages 374-377 in the textbook, then answer the rest of the questions and problems on the worksheet.
Video 3
If there is extra time in class, this video introduces momentum in collisions.
Hint: A “vector quantity” just means you have to pay attention to the direction. You’ll spend more time on vectors later in math, but all you need to remember is that you can have positive or negative momentum if they are going in opposite directions.
Elastic collisions are ones where the two objects bounce off each other and don’t stick. Inelastic collisions are where they stick together and move as one object after the collision.
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2/25 AP: Energy test review
Today we will be looking at the energy unit test, then continuing to work on momentum and collisions.
Momentum test on Friday.
2/25 PotU: Mousetrap car design
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Today
- Complete the first two pages.
- One page one, describe the choices you made for each part of your car, and explain why you chose that style.
- On page two, make a few sketches showing how your car will be put together.
Timeline for project
- Wednesday: Learning about momentum, continue finding parts for your car at home.
- Thursday: Build day 1. Today you will put together your car in a ‘rough draft’ style: you build it, but pay attention to changes you could make as you test it out, then revise your model.
- Friday: Build day 2: Today you will need to test your rough draft car to ensure it makes it five meters. You can also tweek your design as needed.
- Monday: Learning about momentum. You can work on your car outside of class if needed.
- Tuesday: Official test for your ‘final version’ car.
2/24 PotU: Quiz on earthquakes and tsunamis
Warm up
Look at your notes sheet with your table partners. Add one thing to your notes that your partners had but you didn’t, and write this in your warmup section as well.
Quiz
Short introduction to mousetrap car project
2/21 AP: Identifying models in problem solving
Evaluating problems to determine models used.
Read problems 46-55.
Working in trios, you will be assigned one problem. For each problem:
- Draw sketch(s) and add labels for any information given.
- Your sketch will usually need a ‘before instant of collision’ sketch as well as and an ‘after instant of collision’ sketch.
- In some case you may need an additional sketch showing what happened after the instant of the collision.
Homework
Solve six of five of problems 46-55.
2/21 PotU: Preparing for earthquake quiz
Warm up
Copy and fill in the following table:
| P wave | S wave | |
|---|---|---|
| Stand for | ||
| Type of wave | ||
| Faster or slower | ||
| More or less damaging | ||
| Earth moves up/down or forward back |
Napa Quake Ground Deformation, Aug 24, 2014
Classwork
- Quiz on Monday.
- Today, create one page of notes:
- Front page written notes.
- Back side drawings only.
- Use your notes on the handouts from the last two days, as well as the textbook, pages 684-689. Anything from these may be on the quiz.
2/20 AP: 1D collision wrap-up
Here are the solutions to the homework problems, so you can check your work:
- #19: v f golf ball = 0.65 m/s
- #20: (a) v f rifle = 0.49 m/s; (b) v f man & rifle = 0.020 m/s
- #21: (a) v f girl = 1.15 m/s; (b) v f plank = 0.346 m/s opposite the girls motion
- #25: v f arrow = 1.67 m/s
- #27: (a) v f cars = 1.8 m/s; (b) K lost = 2.16×104 J
- #28: v i bullet = 529 m/s
- #29: height bullet & ball = 57 m
- #31: v f Gale & bro & sled = 15.6 m/s
Tomorrow we will look at collisions in two dimensions!