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

The Week of 12/10-12/14

This week you have an inquiry lab (Air Resistance Lab) to complete and a test (Chapter 4) to take. 

• Mon 12/10:  Check off problem #18 on Chapter 4 Worksheet.  Reminders about Air Resistance Inquiry Lab.  Work on Chapter 4 Review (answers to be posted later).  SPARK lecture on pediatric nephrology at 3:30 in room 169.  Bring in your Air Resistance Lab for peer editing tomorrow.
• Tues/Wed 12/11-12/12:   Peer editing of Air Resistance Lab.  Go over Chapter 4 Review sheet.
• Thurs/Fri 12/13-12/14:  Turn in Chapter 4 Review.  Take Chapter 4 Test.  Turn in Air Resistance Inquiry (make sure you get it in to me by 2:00 pm Friday!)

The Week of 12/3-12/7

• Mon 12/3:  Check off HW probs 10-17 (14 is extra) from Chapter 4 WS.  Slipping and Sliding Lab.  Explain and do it.  Lab due Thurs/Fri.  SPARK lecture on Engineering today at 3:30 in room 169.
• Tues/Wed 12/4-12/5:  Go over 2nd part of Slipping and Sliding Lab.  Do Problems 18+19 on Chapter 4 WS for homework.  Introduce Air Resistance Lab and do pre-write.  (pre-write must be completed before you do this lab on Thurs/Fri).
• Thurs/Fri 12/6-12/7:  Turn in Slipping and Sliding Lab if not already.  Do probs 18+19 of Ch 4 WS.  Get your pre-write for Air Resistance Inquiry checked off, then collect data.  Start processing data when finished.  Completed Lab Report due next Tues/Wed 12/11-12/12.  Hand out Chapter 4 Review.  Test next Thurs/Fri 12/13-12/14.