# 141 Fall 2017 Week 3

Back to Main Class Website

Monday:
We are going to graph some of our own motion, forces, energy, and power tomorrow. I show you how I did it in #3 below. #2 is a super cool way to do it (in my opinion), but some students had difficulty getting the software to work. The full description of the project can be found on a link from the main class website.

Before Class. Please watch the following videos:

1. Please view the video kinematic graphs, LIVE! and watch me draw graphs on a board to represent my motion on a bicycle.
2. View Smarter Every Day Grasshoppers, and try to repeat his experiment with the other grasshopper. You may have an easy time doing this, or you may have great difficulty because of software compatibility. A past student wrote this to help tracker instructions. Please work together. In the face of fighting with malicious software, you need good friends. All the same, if it doesn’t work for you, please do your best to estimate the acceleration using my Excel method in the graphing video I did below. One student was able to get tracker to work on a Mac only after transforming the video into a .mov… here it is Grasshopper .mov
3. I graphed my motion without Tracker. Please view: Graphing running
4. See a video about how to measure power.
5. Tomorrow, Tuesday, we’re going to meet at Via Carta to take videos of us to calculate kinematics, forces, energy, power, and look at momentum conservation. The first project description link is on the main class webpage. Please take a look at it.
6. Readings 2.3 Graphical Analysis of Kinematics
7. See solutions to Big Exam #1 on main class website.
8. Find a description to project #1 on the main class website.
9. PS#1 Solutions posted

During Class
Warm up problems,
Practice and prepare for activity tomorrow.

Tuesday: Meet at Via Carta Today!
Office Hours are 10 AM
The vector sum of the Forces = mass * acceleration.
we will take an analyze data on our movement.

Before Class

1. PS#2 is posted on main class website. Please see.
2. Graphing a ball toss.
3. Please see how I solved the
4. PS#3 is posted. Please read through it before class to see what’s coming.
5. I was wrong about office hours yesterday. Monday office hours are at 4:00, not 1:00. So, anyway, we had a good time after class. But next Monday, we’re revert to 4:10 office hours.

During Class:
Meet at Via Carta by the lowest side of our building and record your video. Bring anything you may need.

Wednesday: Office Hours Immediately After Class
We will explore more complicated dynamics problems.

Before Class

During Class

• So ends two weeks of 141. How is your experience so far?
• Work on your project. Finish it up!

Thursday: Vectors in the four lenses, proving energy formulas.

Before Class

1. The Elevator Dynamics Problem
2. Please see this video demonstrating the dynamics protocol.
3. Bozeman Science FBDs
5. Your feedback from today is posted on the main class website.

Then what is equilibrium? How do we find the resultant force? We introduce the “dynamics protocol” (Quiz on this today)

During Class

• Big Exam #2 Be ready to demonstrate perfect dynamics protocol.
• How do you keep the water in the bottom of the bucket?
• Hand in project #1
• A string breaks

After Class: Office Hours are Friday, Immediately After Class
Would you like to have a garden, or learn about aquaponics, growing mushrooms? Bee keeping? Tree nursery? Please consider coming to the
Student Experimental Farm this Sunday at 11 AM, or thereabouts. How do I get to the SEF?

Optional video: Veritasium on how they measured gravity waves