# 141 Fall 2017 Week 11

Wow, last week of classes. We will review material while exploring new questions. Additionally, we will add trigonometry and you will be allowed to use the two kinematic formulas that most classes introduce in the first week of classes, now that you are able to solve questions without these formulas.Monday

Before Class

• PS#11 posted. Due This Thursday.
• PS#9 Solutions posted. Please see them and understand how to do them.
• See video on Fuzzy Dice
• Watch this video: Spinning Skater What are the forces on a skater’s arms when she is spinning very fast?
• Please see some old problems Solving flywheel with hanging mass This video is from winter quarter, 2016 so the problem number is different.

In Class:
Minimizing the other person’s torque in an arm lock

After Class
This week, you will be asked to fill out two surveys/evaluations for this class. One comes to you via Email (I think) from the university.
The other I have made to help me better understand your experience in the class and better serve future students.

Tuesday:

• Solving the Ladder Problem, this is from winter quarter 2016, so the number of the problem is different
• See a video from last quarter regarding trebuchet.
• Also see this from BurningMan
• If you haven’t already, please fill out the course survey I made to help me understand your experience in the class. Please do the survey, and I’ll bring cookies to the final exam!
• Please fill out the university’s student evaluations that were Emailed to you.

In Class
Hand in your final version of project #1.

Wednesday:
Bring your bike to class day!!
first hour
Before Class

• Surveys: Please take the university survey for this class. The link was sent to you via Email.
• See video from your colleagues Toy Car Catapult
• Solutions for PS#9 posted, Solutions for PS#10 posted
• Please do this fifth and final 10-question mechanics survey.
• Hey in doing the last question on PS#10, remember that the disks were at a radius of 20 cm from the center of the spinning wheel, and moved 60 cm horizontally as they fell 110 cm to the floor. Also remember that the slide when the surface was inclined about 20 degrees with respect to the horizontal.
• Please fill out the university’s evaluations of this course.
• Do problem #1 on the problem set.

In Class:

• Bring your bike to class day! we explore bicycle transmission.
• Hand in your corrections for project #2. This could be in a form of a new video or a written document.

After Class

Thursday: Wow… our last class.
Revisit the choo choo train ball toss on an inclined plane
Before Class

• See video on solution for 2D inelastic collision from a problem set from years past.