Answers to 5+6 Review (for test on Thurs/Fri 1/24-1/25)

1.  35 J (or 40 2/ sig figs)
2.  4820 J
3.  3700 J
4.  -.196 J (the negative is debatable)
5.  -54 m/s
6.  560 W
7.  36 m/s west
8.  2.6 kg m/s
9.  -390 N, 0.13 meters

1/14-2/1 (End of Semester)

We're getting down to the end of the semester!  This week we will do our Egg Drop and the next week we will take a short test on Chapter 5 and some of Chapter 6.  You will get a semester review this week to help you get ready for the final exam.  Finally, all late work and extra credit is due by Friday, January 25th.

• Mon 1/14:  Check off problems 17-19 and go over.  Physics power.  Do problems 20-23 for Tues/Wed.
• Tues/Wed 1/15-1/16:  Check off 20-23 and go over.  Impulse-Momentum Theorem and examples.  What is the significance of the yellow line at the front of a Tri-Met bus?  Do problems 1-7 on Chapter 6 worksheet.  Introduce Egg Drop Contest and do some preliminary work.
• Thurs/Fri 1/17-1/18:  Check off problems.   30 minutes for work on Egg Drop, then go outside and drop them, and turn in Write-Up (to be described in future post).  Hand out 5+6 Review and Semester Review.
• Mon 1/21:  Martin Luther King Day Holiday.
• Tues/Wed 1/22-1/23:  Turn in Egg Drop Write-Up if not already.  Go over Chapter 5 and some 6.  Start going over Semester Review.  Short 5+6 Test on Thurs/Fri.
• Thurs/Fri 1/24-1/25:  Turn in 5+6 Review.  Take 5+6 Short Test.   Go over Semester Review Problems.
• Fri 1/25:  Deadline for late work and extra credit!!
• Mon 1/28:  Full 8 Day.  Last minute questions on Final Exam.  How to calculate your goal percentage on Final Exam.
• Tues-Thurs 1/29-1/31:  Final Exams!
• Friday 2/1:  No School.  Teacher Work Day.

Quick Lab: Is Energy Conserved? Due Thur/Fri 1/10-1/11 (can turn in Mon 1/14 on time)

Drop 2 different masses (coins) from 2 different heights and determine if energy is conserved. (that makes 4 conditions total)

1.  Make a neat, labeled data table: What do you need on it?

2.  Collect data (5 trials each:  then calculate average and uncertainty for trials)

3.  Do calculations: Vf, Pei, KEf (show work for 1 sample of each type)

4.  Is energy conserved?  Compare numbers directly and give reason for your answers.

5.  Discuss factors that contribute to uncertainty in data (solid paragraph).

The Week of 1/7-1/11

• Mon 1/7/13:  Check off Problems 7-11 and go over.  Conservation of Mechanical Energy.  HW problems 12-16 for Tues/Wed, although you will get time to work on them.
• Tues/Wed 1/8-1/9:  Questions on Homework?  Work time.  Work-Kinetic Energy Theorem.  Do problems 17-19.  Quick Lab:  Is Mechanical Energy Conserved?
• Thurs/Fri 1/10-1/11:  Check off Probs 12-19 and go over.  Turn in Energy Conservation Quick Lab. What is Power?  Run the stairs and calculate your power.  HW probs 20-23.

Happy New Year! The Week of 1/2-1/4

• Wed 1/2  (Full 8 Schedule):  Introduce the physics concept of work and how to apply it to problems. Do problems 1-5 on Work and Power problems for Thurs/Fri (#6 is extra credit).
• Thur/Fri 1/3-1/4:  Check off problems and go over.  Introduce the concept of kinetic energy and potential energy.  Do problems 7-11 for Monday 1/7.

OMSI Opportunity on Monday, 12/17

Lincoln students and their families have the opportunity to go to OMSI for free (w/ student ID) on Monday 12/17 from 6:00-8:00 pm.  There is a special exhibit called "Race:  Are We So Different?"  You can get extra credit for this class by writing a 1-2 page summary of what you see at the exhibit and what you think about it.   After you see the exhibit on race, go to the Turbine Hall and see the cool stuff they have on Physics!

Answers to Chapter 4 Worksheet and Chapter 4 Review Sheet

Chapter 4 Worksheet

1. a-f do in class
2. a) 23.8 N, b) 7.73 N
3. a) see in class b) 30.0 N left c) 330. N up d) 331 N at 84.8 degrees left and up from horizontal
4. 23. m/s^2
5. 1.4 m/s^2
6. 14 N
7. 2.1 kg
8. 37 N
9. Fa = 3.6 N, Fb = .4 N
10. 98.1 N
11. 51.0 kg, 112 lbs
12. mass stays the same, weight decreases
13. -4.2 m/s^2
14. 5 kg
15. a) 981 N, b) 640 N
16. 730 N
17. 3.73 m/s^2
18. 0.444
19. a) -.981 m/s^2 b) 29.4 m
20. 68 degrees 

Chapter 4 Review Sheet Answers:
1.  430 N
2.  20.0 kg
3.  52.0 kg
4.  477 N
5.  a)  57.9 N    b)  23.5 N    c)  3.9 N
6.  6786 N
7.  -1.48 m/s^2
8.  49 N
9.  250 N
10.  51 N
11.   a)  -.981 m/s^2    b)  98.5 m