__Tuesday__:**Before Class**

- Midterm #2 is Thursday.
- Then see the video about how to solve the A System of Masses Using Energy
*WOW,**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
- Please read 6.1 Rotational Systems that
- Watch Rotational Systems
- Check out the physics of the pinewood derby
- BE! #5 solutions posted on main class website
- Watch
*Parallel Axis Theorem* - Please read 6.2 Center of Mass
- Please read 6.3 Parallel Axis Theorem
- See one way for Solving flywheel with hanging mass (this is the worked solution) (2 minutes)
- See a system of masses using work and friction (2 minutes)
- Watch solution to problem Barbell Spinning in Space
__Optional Video__: Does a feather really fall the same as a bowling ball in a vacuum? See Human Universe do it.- Consider going to the talk by Derek Featherstone on providing access to all people.

.

**During Class**

- Big Exam! #6
- Discussion, demos, preparation

**Thursday, Midterm #2**

Some more study resources:

- Solutions for PS#6 posted
- Here is the midterm I gave to a 141 class, Fall 2017. These questions are representative of what you can expect, but likely your test will be considerable shorter (just 3 or 4 of these questions): MT#2, MT#2_with_comments, MT#2_Solutions,
- From Spring 2017 – please disregard question #1 as it is more complicated than something I would put on your exam: MT#2 + extra problem, MT#2 Solutions, MT#2 help on #1, #5
- You may find questions 3 and 4 valuable from Fall 2016 (questions 1 and 2 are kind of complicated and I wouldn’t recommend them): MT#2, with two more (underlined) questions for greater practice MT#2 Solutions
- Please consider taking PSC-391/491, a GE D5.
**Sustainability, poverty, equity.**