1. Today’s Warm-up Welcome to Second Semester! Pick up a new assignment sheet, Start of Quarter Assignment, and class notes handout on our next topic: Linear Momentum. Read the Start of Quarter Assignment and think about a physicist you want to learn more about… To Do Read Momentum Chapter Start Problem Set 7A/MC1 Find Article for Start of Q3 Assignment Hphys and Phys Monday 1/28/13

2. Linear Momentum is Mass times Velocity What makes a moving object have a lot of momentum? How can you change the momentum of a moving object? Football Momentum

3. Impulse is Force times Time Interval Impulse is needed to change an object ’ s momentum. Greater impulse (and change in momentum) can be accomplished by increasing FORCE or TIME What TWO ways could you increase the impulse of the racquet on the ball? http://www.hiviz.com/GALLERY/eckerson/impacts/AE-2-12R.JPG

4. How are force, time, and momentum change related? How can you reduce the force required to change the momentum of a moving object? What is a real-world example of this?

5. Examples of Impulse Airbags increase the time to change your momentum, so less force is needed. http://www.physicstogo.org/images/features/AIRBAG-large-090507.jpg Pole Vaulter Landing on a soft pad increases the time and reduces the force needed to change her momentum http://i.telegraph.co.uk/telegraph/multimedia/archive/00791/yelenaisinbayeva160_791463i.jpg football pads, helmets

6. When is linear momentum conserved? http://www.lhup.edu/~dsimanek/scenario/collision-r.jpg When there in NO IMPULSE (= change in momentum) When there are no OUTSIDE FORCES When the system is closed

7. How are collisions related to momentum? Most collisions occur in short time intervals and the colliding objects can be considered a closed system. Momentum conservation can be used to solve collision problems. http://cheezeworld.com/wp-content/uploads/2008/11/collision.jpg

8. Test your understanding of MOMENTUM Which has more momentum, for each pair? 2200 lb.Mazda Miata 7000 lb. Chevy Suburban going 10 mphgoing 10 mph Chevy Suburban going 10 mphMazda Miata going 100 mph Barbie traveling 1 mphChevy Suburban at rest

9. Test your understanding of IMPULSE Which requires more IMPULSE, for each pair? Stopping a Chevy Suburban going 50 mph, in 10 secondsgoing 10 mph, in 10 secondsStopping a Chevy Suburban going 5 mph, in 10 secondsgoing 5 mph, in 1 secondStopping a Chevy Suburban going 50 mph, in 10 secondsgoing 5 mph, in 1 second Which requires more FORCE?

10. Today’s Warm-up Look in your notes for the Cartoon Guide to Physics pages on impulse and momentum. READ them! Do you have questions about the reading or the problem set? To Do Read Chapter 7 Start Problem Set 7A Start of Quarter assignment HPhys Tues. 1/29/13 http://www.youtube.com/watch?v=jrNEsA5f8no http://www.youtube.com/watch?v=VmtYeEGGreM Why are cannons on wheels?

11. Today’s x-Period Can you FINISH your Tech Portfolio? Show Dr. Hair Problems 1, 2 of Problem Set MC1 Go over your midterm exam, if you want to Pick a card and find a physicist for your Start of Quarter assignment Look for an article, if you want to. Clean out class folder and physics binder Phys Tues. 1/29/13 Coming up Read Lesson 1 in Physics Classroom Continue Problem Set MC1 Start of Quarter assignment

12. Today’s x-Period Can you FINISH your Tech Portfolio? Go over your midterm exam, if you want to Pick a card and find a physicist for your Start of Quarter assignment Look for an article, if you want to. Clean out class folder and physics binder Start Problem Set 7A Talk to Dr. Hair about summer internship for JUNIORS at CRREL. Hphys Weds. 1/30/13 Coming up Read Chapter 7 Problem Set 7A Start of Quarter assignment

13. Today’s Warm-up Look in your notes for the Cartoon Guide to Physics pages on impulse and momentum. READ them! Do you have questions about last night’s reading or problems? To Do Read Lesson 1 Continue Problem Set MC1 Start of Quarter assignment Phys Weds. 1/30/13

14. Today’s Warm-up Compare energy and momentum by completing the table on p. 8 of your class notes. To Do Quiz on Impulse and momentum TODAY! Problem Set 7A due FRIDAY! Start of Quarter Assignment due MONDAY! All portfolio uploads! Hphys Thurs 1/31/13

15. Today’s Warm-up Look at your notes from our last class and finish the questions on p. 8 and 9 of your class notes. Ask for help, if you need it. To Do Read Lesson 1c Problem Set MC1 due Friday QUIZ TODAY!! Start of Q3 assignment Mon. Tech Portfolio uploads Phys Thursday 1/31/13

16. Today’s Warm-up Turn in Problem Set 7A in the back of the classroom. A spacecraft of mass 456 kg is traveling through the solar system at 234000 m/s, and it needs to be slowed down to 2340 m/s. This must be accomplished in 2.00 minutes. There is a variable-power rocket engine available, but YOU must tell the pilot the correct number of Newtons to plug into the navigational computer. How many? To Do Read the rest of Chap. 7 Start Problem Set 7B Start of Q3 assignment due MONDAY! Portfolio uploads! Hphys Friday 2/1/13 Class Today Practice problem Air Track Demo

17. Today’s Warm-up Take out your completed problem set for Dr. Hair to check. Compare energy and momentum by completing the table on p. 12 of your class notes. To Do Problem set due TODAY Start of Quarter Assignment due MONDAY! All portfolio uploads! Phys Friday 2/1/13

18. Today’s Warm-up Turn in Start of Quarter Assignment Pick up a new LAB handout and get a lab group of 2 or 3 people organized. In your class notes, p. 15, work out a method to solve the ham and cheese problem. HPhys Monday 2/4/13 Class Today 2-d momentum Start Momentum Lab To Do Start of Q3 assignment due TODAY! Wednesday = lab work day Thursday Quiz on Momentum Conservation Problem Set 7B due FRIDAY!

19. Today’s Warm-up Turn in your Start of Quarter Assignment in the in- boxes by your folders. Class notes, Front page: Can you solve this problem using conservation of momentum?? Phys Monday 2/4/13 Class Today Air Track Demo Start Momentum Lab To Do Start of Q3 assignment due TODAY! Lesson 2a, problems 9, 10,11 due TUESDAY! Tuesday = lab work day

20. Today’s Warm-up Get started on the lab with your lab group. Can you complete your scaled vector diagram for Part 1? To Do Problem Set 7B due Friday Quiz Thursday Class today Collisions Lab Get the tools of the trade! Hphys Tuesday 2/5/13

21. Today is a lab work day Do you have questions on today’s reading or problems? Take out your lab and get started with your partner. You should finish the video analysis and complete the analysis for part 1 before leaving. PHYS Tuesday 2/5/13 To Do Problem set MC2 due THURSDAY! Momentum Conservation Quiz on THURSDAY! Lab due FRIDAY!

22. Today’s Lab Work-x-day Do you have any missing work? Take out your lab and get started with your partner. You should finish the Part 1 scaled vector diagram AND analysis pages before leaving. This is important preparation for tomorrow’s QUIZ! HPHYS Weds. 2/6/13 PLEASE update your calendar Quiz Thursday Friday Q&A on Problem Set 7B Monday PS 7B due

23. Today’s Warm-up To Do Read Lesson 2 Problem Set MC2 due THURSDAY! Quiz on Thursday Lab due FRIDAY! PHYS Weds. 2/6/13 Class Today Problems Q & A Momentum Video Lab Do you have questions about today’s problems? If Yes: Sit in front of the room and ask them If No: Get started on your lab

24. Today’s Warm up Do you have questions on the problem set? It’s now due MONDAY! Please read section 7-5 about this and bring questions on FRIDAY. Are you ready for a quiz on conservation of momentum? To Do Remaining Portfolio Uploads Problem set 7B due MONDAY Work on lab analysis for homework Class today Quiz Continue Collisions lab HPHYS Thursday 2/7/13

25. Today’s Class Take out your problem set, for Dr. Hair to check. If you have questions, ASK NOW! Sit with your lab group and get organized for a QUIZ on Momentum conservation To Do Work on Momentum Lab AT HOME! Problem Set MC2 due TODAY! Class today Momentum quiz Continue lab PHYS Thursday 2/7/13

26. Snow Day Friday 2/8/13

27. Today’s Class What does this picture have to do with conservation of momentum? Open your class notes and start reading p. 13. Take out your work on the current problem set and get a textbook. To Do Problem set 7B due Today Lab due Wednesday Test Friday! MOPS due Friday! Class today Elastic Collisions and HOPE Q & A on problem set Continue Collisions lab HPHYS Monday 2/11/13

28. Today’s Warm-up To Do Lab due TOMORROW! Problem Set MC3 due Thurs! MOPS due Friday! TEST on FRIDAY! PHYS Monday 2/11/13 Class Today Conservation of Momentum Problems Finish Momentum Video Lab Is your lab ready to turn in? If Yes: Turn it in and open your class notes to page 13 and start the problems If No: Get going on your lab

29. Today’s Warm-up What kind of collision is shown this picture? What is conserved? Take out your lab and get started with your group. Have you picked your challenge for Part 3? Figure out what you will do with your group and get started. To Do Lab Due, end of x Weds. Review Problem Set, MOPS due Friday Study for test on Momentum FRIDAY! Class today Part 3, Momentum Lab Prepare informal presentation HPHYS Tuesday 2/12/13

30. Today’s Warm-up What sports involve collisions? What are examples of collisions in your favorite sport? To Do Sports momentum slide due Weds. Problem Set due Thursday Study for test on Momentum FRIDAY! Class today Q & A on today’s problems Collisions in Sports research PHYS Tuesday 2/12/13

31. Today’s Warm-up What kind of collision is shown this picture? What is conserved? Take out your lab and get started with your group. It is due TODAY, at the end of school. To Do Lab Due, end of school Review Problem Set due Friday MOPS due Friday Study for test on Momentum FRIDAY! Class today Finish Momentum Lab Prepare informal presentation on Part 3 HPHYS Weds. 2/13/13

32. Today’s Warm-up With your group, complete your sports momentum problem slide, for the class presentation. Do you have questions on today’s problems? Phys Weds. 2/13/13 To Do Sports momentum slide due today! Problem Set due Thursday Study for test on Momentum FRIDAY!

33. Today’s Review Day Do the Reality Check on Momentum and Impulse Take out your problem set notebook and get ready to ask question about the review problem set (due TOMORROW). To Do Complete Review Problem Set MOPS Study for test on Momentum FRIDAY! Class today Q & A on Review Problem set Momentum review HPHYS Thursday 2/15/13

34. Today’s Review Day Take out your reality check and do it by yourself, quietly Take out your problem set notebook and get ready to ask question about the problem set, due today. To Do Problem Set MC3 due today Study for test on Momentum Tomorrow! Class today Q & A on Review Problem set Momentum review PHYS Thursday 2/14/13

35. Momentum Test Today Sit down in a separate spot with your calculator, pencil, and the tools of the trade, if you want them. When you are ready, we will have a quick review. PHYS and HPHYS Friday 2/15/13 Honors Students, Please turn in your problem set notebooks in the front of the room. Impulse and Momentum

36. Today’s Warm-up Class notes, page 12: Can you answer these 3 questions with a partner?? To Do Read the rest of Chap. 7 Start of Q3 assignment due MONDAY! 5 Portfolio uploads due TUESDAY! Next Tuesday = lab work day Beta Weds. 2/1/12 Class Today 3rd Law/force/impulse reprise Finish overview notes, Q & A Air Track Demo Collision example problems

37. Today’s x-day 1.Finish your lab and turn it in 2.Save a print out of your lab as a PDF and upload it for your tech portfolio, if you need a PROBLEM SOLVING example. 3.Please take a picture of your lab group and come up with a pithy quote for your parents, for the open house on Thursday. Upload this to the class Open House presentation. 4.Go over last week’s quiz. 5.Do you have any missing work? 6.Start the 7 Review problem set 7.Prepare for FRIDAY’S TEST on MOMENTUM To Do Lab due today! Review Problem Set due Friday Study for test on Momentum FRIDAY! Alpha Weds.2/8/12

38. Today’s x-day 1.Finish your lab and turn it in 2.Save a print out of your lab as a PDF and upload it for your tech portfolio, if you need a PROBLEM SOLVING example. 3.Please take a picture of your lab group and come up with a pithy quote for your parents, for the open house on Thursday. Upload this to the class Open House presentation. 4.Do you have questions on today's problems? 5.Are you ready for tomorrow's sports momentum presentation? (One slide per group) 6.Prepare for FRIDAY’S TEST on MOMENTUM To Do Lab due today! Sports momentum slide due Weds. Problem Set due Thursday Study for test on Momentum FRIDAY! Beta Tuesday 2/7/12

39. Today’s Warm-up Take out your work on Problem Set 7B and get a textbook for your table please. We will start with Questions shortly. Have you finished Part 2 of the lab? To Do Lab due WEDNESDAY! Start Problem Set 7R, finish MOPS TEST on FRIDAY Class Today Problem Set Q & A Momentum lab HPHYS Tuesday. 2/12/13