AT Cycle 33
4/2 - 4/5
T 4/2
W 4/3
Th 4/4
F 4/5
🔴 2: W 4/3a, 🟡 4: T 4/2, 🔵7: T 4/2 - ↩️ Pivot air resistance (2)
Today, we will study velocity dependent forces with a lab in ↩️ Pivot Interactives called "Falling Coffee Filters." If you are present for this lab, you may skip the first section in the Pivot "Kinematics of Motion Through a Resistive Media", and start with the section "Drag vs Velocity for Falling Coffee Filters". If you are absent for the data-taking class (this class), then you should do the first section and use the Vernier Video Physics web app which is accessible through ClassLink.
In this lab, we will investigate the concepts of air resistance (drag) and terminal velocity. You'll be analyzing videos you take and graphing position vs. time and velocity vs. time in Vernier. You'll see how drag force relates to velocity. Make sure to add rows in the data table to have 6-7 trials.
By the end of this lab, you will be able to:
Describe the force of air resistance.
Describe the motion of an object falling in the presence of air resistance.
Describe how air resistance varies with velocity.
Name some other variables that affect air resistance other than velocity.
Name some real-life situations where air resistance is beneficial or detrimental.
Homework: Lab due in ↩️ Pivot on Wednesday, April 3rd at 10pm. Watch the following video on velocity dependent forces. At time 6:00, pause the video and practice solving the differential equation on your own. (It will probably be faster than watching the whole video.) After you make your best attempt, fast forward to see if you were right. Then, at 17:00, listen to the notes at the end.
(Just for fun, what do you get when you cross Veritasium with Myth Busters? How dangerous is a penny dropped from a skyscraper?)
🟥 2: W 4/3b, 🟨 4: W 4/3, 🟦 7: W 4/3a - ✏️ velocity dependent forces problems
Today, first finish the lab if you have not yet already. Then, you'll use what you've learned to try a few problems with velocity-dependent forces:
Required: 1982M2, 1990M1, 2000M2
Homework: The above velocity dependent force AP problems are due to ✏️ Google Classroom on Thursday, April 4rd at 10pm. Also...
Watch the following video on simple harmonic motion (SHM):
Check out this video for a better understanding of "angular frequency" ω (aka frequency of oscillation) and how it relates to the angular speed ω we already studied in rotation:
❤️ 2: Th 4/4, 💛 4: F 4/5a, 💙7: W 4/3b - simple harmonic motion
Today, we'll continue with a brief discussion of the equations that describe simple harmonic motion. It will be a more in-depth review of the video that you watched last night.
If you missed class or if you'd like to review, watch the following video explaining the calculus of solving simple harmonic motion. This video is really similar to the lecture I would have given in class. This is one of the videos I would really pay attention to! There's a lot of important information packed in here! Watch it slowed down, pause to think about the analyses (especially in the graph section at the end), and watch it multiple times!
With any time remaining, watch the homework videos below, and start the required Oscillation AP Problems (2009M2, 1990M3, 1999M2) from the next two posts.
Homework: Oscillation problems due to ✏️ Google Classroom by Tuesday, April 9th at 10pm. Watch the following two videos on simple harmonic oscillators with springs and pendulums. Alternatively, learn about simple harmonic oscillators using the available media of your choice - textbook, internet, etc.
Small angle approximation: For small angles
θ (in radians) ≈ sin θ ≈ tan θ
📕 2: F 4/5, 📒 4: F 4/5b, 📘7: Th 4/4 - physical pendulum lab
Today, we'll design an experiment to find the moment of inertia about the center of mass of an odd shaped object. In order to do this, you'll have to understand the motion of a physical pendulum. Once you finish taking data, you'll finish your brief individual write-up of this lab. Do your write-up on loose 0paper which you can turn in in hard copy. Your analysis should include a labeled sketch of the set-up, at least one free body diagram, sentences about what you did and why, and calculations necessary to find the moment of inertia about the center of mass. YOU MUST DO AT LEAST TWO DIFFERENT TRIALS to verify your calculation of the moment of inertia ABOUT THE CENTER OF MASS.
With any time remaining, watch the homework videos below, and start the required Oscillation AP Problems (2009M2, 1990M3, 1999M2) from the next post.
Homework: Oscillation problems due to ✏️ Google Classroom by Tuesday, April 9th at 10pm. 📄Lab write-up due on paper in class Tuesday, April 9th.