141 Winter 2018 Week 7


Before Class

Before Class

  • No office hour at 3:00 today. Sorry for the late notice. I won’t be available for office hours today. However, you should all meet there anyway in my absence and work problems.
  • Midterm #2 is next week Wednesday.
  • Then see the video about how to solve the A System of Masses Using EnergyWOW, I watched the video myself and … it’s really fast. It’s hard for me to follow it (and I made it). I remind you that I condense these discussions as much as possible. They are meant to be stopped every few seconds so you can take notes on the video or just think about what was said.
  • Please see how to solve a system of masses using dynamics
  • Does a feather really fall the same as a bowling ball in a vacuum? See Human Universe do it.
  • Please take this second 10-question Survey…. actually only an 8 question survey. This counts as a video for credit... and it’s fun (right?) so please do take it.

During Class

  • Big Exam #5

Thursday we look at a rotational system

Some more study resources:

During Class

  • After class, please come to the Development Showcase: 7-9 in Chumash… free food!
  • Discussion, demos, preparation

Wednesday, Midterm #2

Solutions posted for PS#6 on main class website.
The midterm will cover everything we’ve done up until now. The material since MT#1 will be focused on. However, of course everything from before will be necessary to understand the more recent material.

Thursday: 2D mechanics (no trig).

We have done linear mechanics in a straight line and rotational mechanics. Now we will introduce components, angles, and trigonometry and spend the last three weeks reviewing the same curriculum with the inclusion of angles. This is a great opportunity to improve conceptual knowledge.

Before class

  • It’s 12:20 AM. I finished grading the first question. I’m posting my comments and updating them as I go along. Please check the MT#2 comments on the main class website. I’m going to bed now and I’ll pick it up in the morning. I updated with Question #2 at 8 AM. Finished at 2 PM. Come to office hours to see your exam if you like.
  • Redo the MT#2 in fine form. The exam is posted on the main website along with some intended to be helpful hints. Please do all 6 problems and the extra questions I added to a few.
  • PS#8 has been posted, please take a look. as soon as possible I may make a few minor changes/additions.
  • Notes for final exam – don’t let your formula sheet get any longer. As we add a few (very few) new formulas, you will want to drop others that are obvious to you now.
  • Watch Intro Video to 2 Dimensions (3.8 minutes)
  • See the video on estimating vector components (1.5 minutes)
  • See the video on 2D Components of Force (8.5 minutes)
  • See 2-D kinematics (3.5 minutes)
  • Watch this famous music video… how did they make that video? I mean, do you love it? You’ve seen it already, right?
  • Read 7.0 in your textbook.
  • Check out PS #7, posted on main class website.

I’m offering a special service to help prepare for the final exam if you didn’t get full credit on a MT#2 question. I will “grade” your corrections for each problem that you want me to in order to make sure you got it right. Please decide which questions you want me to grade. Then you do the problem as if you were handing it in on an exam. After you understand what you did wrong and how to do each problem correctly, please sit down and do the problem with only a formula sheet. Then staple the problems together and submit them to me. You don’t need to include the original MT#2. Next Monday please give me these separately from handing in the problem set. I’ll “grade” them and hand them back Tuesday.

In Class**

  • Review Midterm #2 – Exam Returned
  • Practice Components
  • Hand in project #1 in final form