Answers to 5+6 Review

1.  35 J
2.  4820 J
3.  a) 18.4 J  b) -10.2 J  c)  8.2 J
4.  3700 J
5.  -54 m/s
6.  980 W
7.  36 m/s west
8.  2.6 kg m/s
9.  -390 N, 0.13 m
10.  -0.60 m/s
11.  10. m/s
12.  4.5 m/s, 8.0 kg

Egg Drop

On Thursday 12/16 we will be dropping our Egg Drop contraptions off of the rear of the Lincoln stadium.  We will have time on Tuesday to work on the contraptions as well as about 40 minutes on Thursday.  You can do this by yourself or with one other person.

The categories are:
1)  Open category:  almost anything goes, but try to make it interesting.  Do not use any substances that will explode or make a mess upon impact.  The dropper will be responsible for cleaning up any messes.

2)  Limited materials.  I will provide clear drinking straws, masking tape, string, rubber bands, and paper.  Quantities used should be within reason.   Parachutes are banned from this category.

The Write Up:
1)  Labeled diagram of your contraption including metric measurements and materials used.
2)  Discuss 3 of the physics principles that are involved in the egg drop.
3)  After dropping:  How did it go?  If the egg broke, what would you do to try to improve the design?  If the egg didn't break, what would you do to challenge yourself further? 

Turn the write up in by Friday 12/17.

The Week of 12/13-12/17

• Monday 12/13:  Check off HW p. 211 1-4 and go over.  Conservation of Momentum.  HW p. 219 1-3.  Determine Egg Drop Rules.
• Tuesday 12/14:  Check off p. 219 1-3 and go over.  Hand out 5+6 Review Sheet.  Start building Egg Drop contraptions.  Egg Drop Rules will be posted Monday 12/13.  Final Draft of Spring Lab due tomorrow with Color-Marked version.
• Thursday 12/16:  Turn in Final Draft of Spring Lab and Color-Marked version.  Build Egg Drop Contraptions and Drop from the Stadium bleachers!!  Turn in Egg Drop Design.  Go over 5+6 Review.
• Friday 12/17:  Turn in 5+6 Review.  Short 5+6 Test.  Write down plan for Physics in Motion Project.

Have a Fantastic Winter Break!!  Remember that the Physics in Motion Project is due Thursday, January 20th.

The Week of 12/6-12/10

Reminder, there is a late-opening this week on Wednesday, so there is no FLEX on Wednesday.  I will still be available Tuesday during lunch.

Monday 12/6:  Bring in your completed line graph from Friday's lab.  Discuss graph and transforming data for inquiry lab.  Discuss conclusion for inquiry lab.  2nd Draft of Spring Inquiry due Friday.  We will do peer editing on that day.  Conservation of Mechanical Energy.  HW p. 182 1-5.
Tuesday 12/7:  Check off HW and go over.  Work-Kinetic Energy Theorem and Power.  Hand-out Work and Power worksheet, due Friday.
Thursday 12/9:  Introduce "Physics in Motion Project".  Library research.   Finish Work and Power worksheet and/or work on Spring Inquiry Lab.  2nd Draft of Spring Inquiry due tomorrow.
Friday 12/10:  Turn in Work and Power worksheet.  Exchange Spring Inquiry labs and do "color marking" (peer editing).  Give feedback to lab writer.  Introduce momentum and impulse.  HW p. 211 1-4.

Final Draft of Spring Inquiry will be due next Thursday 12/16.

The Week of 11/29-12/3 (updated on 12/1)

Congratulations Physics Students.  You have made it through the toughest part of the course!  Traditionally Chapters 3 and 4 are the chapters that give students the most confusion.  But things are just getting going.  Before Winter Break we will do a Full Inquiry Lab, start a project, and do an Egg Drop.  We will definitely be busy!
Here's the week coming up:

• Monday 11/29:  Physics definition of work and kinetic energy.  HW#11 p. 170 1+3, p. 173 1-3 (4 EC).
• Tuesday 11/30:  Check off HW #11 and go over.  Potential energy (elastic and gravitational).  HW #12 p. 177 1-4.  
• Wednesday 12/1:  Mid-day FLEX!  Come in for test corrections, help, or other makeup.
• Thursday 12/2:  Check off HW #12 and go over.  Conservation of Mechanical Energy.  HW#13 p. 182 1-5.   Hooke's Law data taking and Spring Inquiry Introduction. Write up Question, Background, Hypothesis, Variables, Procedure, and Data Table.
• Friday 12/3:  Take Data for Spring Inquiry Lab.  Check off HW #13.  

A Note About Conferences and Grades (Parents Please Read!)

Greetings!  I look forward to meeting many of you at Parent-Teacher Conferences next week.  One thing I want you to know is that I will be at all sessions EXCEPT the morning session on Tuesday.  I think the school reported that .80 time teachers would be absent on the Monday AM session, but I had already made appointments for my own childrens' conferences for Tuesday morning.  So any time but Tuesday morning please come in!

I have been entering grades for 2nd quarter, but be careful when you look at 2nd quarter grades because they only reflect the last 2 weeks of class.  If you want to know your student's accurate SEMESTER grade (the one that counts), please make sure that you are looking at the semester grade report.  Previously I had tinkered with adjusting this by adding a bunch of points to the 2nd quarter grade, but I just undid this because the semester grade calculations were coming out wrong.  If you have any questions, please don't hesitate to e-mail me at mkenny@pps.k12.or.us

Thanks!

Chapter 4 Review

In looking at the Chapter 4 Review, there are 2 problems that you may want to skip and come back to later.  They are #4 and #7.  I apologize that #7 is not very well written.  It should say that a "car is traveling at 50.0 km/h on a flat highway on a rainy day when the driver puts on the brakes."

Here are all of the answers.  We will go over them on Thursday.

1.  430 N
2.  49 N
3.  250 N
4.  0.331
5.  a)  0.883 N    b)  14.0 N
6.   51 N
7.  a)  -.981 m/s2     b)  98.2 m    c)  16.4 m
8.  4990 N
9.  - 1.48 m/s2