Today we started talking about simple harmonic motion. We learned how to write the equations for the position an velocity of an object undergoing SHM. There is no webassign for tonight, please do problems #1-10 on page 436. Solutions are available in the google drive folder for this chapter (14).
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2 more problems for homework: 1984 and 1992. Make sure you score your work and be ready to hand it in tomorrow. Quiz on chapter 13 (gravitation) is tomorrow!
Monday we finished up Chapter 13 (Gravitation) with a discussion of orbital energy and how to change orbits. You have a packet of AP Problems to practice. For tomorrow, you need to do the following Free Response problems: 2005M2, 2007M2, 1994M3. Write up the solution to each problem as if this was the AP exam (i.e., show all of your work!).
Then, using a different color pen, use the solutions guide (find the appropriate year) to score each of your responses. This will be handed in Tuesday and will go into the DAILY WORK category. On Friday we looked at escape velocity, Kepler's Laws, and did some practice problems. On Monday we will finish up with a discussion of energy and work on some AP Problems.
An excellent review guide for the chapter is available in the google drive folder. Yesterday we reviewed Newton's Law of Gravity, and today we looked at gravitational potential energy. Make sure you are working on the webassign problems!
Test corrections are due tomorrow! For MC problems that involve calculations you must show me the correct calculation that leads to the correct answer. For MC concept questions, you must explain why the original answer you chose is wrong IN TERMS OF PHYSICS. For free response problems you must rework the problem ENTIRELY to show the correct solution.
Answers (only) to the test are below: Ver A: 1. A 2. D 3. C 4. A 5. B 6. E 7. A 8. D 9. A 10. A 11. A 12. B 13. E 14. D 15. D 16. B 17. E 18. B 19. C 20. B 21 a) 2mg 21 b) 5/4 mg 21 c) 9/4 mg 21 d) 4mR^2 (some of you got the correct answer for the wrong reason!) 22 a) FBD with 3 forces only 22 b) derivation 22 c) sqrt(24/7 gR) 22 d) 16/7 mg 22 e) v would be larger...why? 23 a) FBD of ladder only showing forces in the location they act 23 b) 124.8 N 23 c) 0.127 23 d) larger ... why? Ver B: 1. D 2. B 3. B 4. C 5. D 6. E 7. A 8. D 9. A 10. D 11. B 12. A 13. E 14. A 15. A 16. C 17. E 18. B 19. A 20. B 21 a) 2mg 21 b) 5/4 mg 21 c) 9/4 mg 21 d) 4 mR^2 (some of you got the correct answer for the wrong reasons!) 22 a) FBD with 3 forces acting on ball 22 b) derivation 22 c) sqrt (32/7 gR) 22 d) 24/7 mg 22 e) v would be larger 23 a) FBD for ladder only showing forces in the location they act 23 b) 117.3 N 23 c) 0126 23 d) larger Monday is the rotation test. You have received 2 practice tests that you can use to study for this test (the solutions are given at the end of the practice tests). There is also a webassign review assignment if you would like more practice. Solutions to the toilet paper problem are available here.
Today we talked about angular momentum, and conservation of angular momentum. Make sure you are trying your webassign!
Today we did a couple of demos, and then looked at how to derive the moment of inertia of a cylinder by adding up thin shells. We also looked at how to find the actual direction of the angular vectors, and talked briefly about cross products.
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REMINDERs:Chapter 2 test retake is Monday 10/15. You can take the retest either before school or after school, but you must complete all of the Chapter 2 homework (75% completion on each assignment) to be eligible for a retake!
Resources:Review videos - excellent videos covering all AP Physics C content.
Viren's Videos (another good source of videos) Study guides/review guides by topic. Archives
October 2018
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