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AP Physics 1: Study outline for Waves & SHM exam

I have decided that we have enough material in this unit to justify this exam as a full test grade, rather than the half-grade that I indicated prior to now.  I believe this exam is fairly easy, but please do not neglect the earlier study of SHM.  Here is a study  outline to help you out. I’m also re-posting my tutorial schedule for next week.  Please make sure that you have all of your work made up.  I will be putting in zeroes in skyward soon for missed quizzes and other items.  Check yo’self, don’t wreck yo’self.  Yo. (Just pretend I said that in my usual deadpan style.  Now laugh.  There.  How’s it feel to let loose with a good chortle?)

Study Guide–Waves-SHM test (part 1)

Tutoring Schedule n10


All classes: Calendar and Tutoring Updates

AP Physics 1 syllabus-Waves-A day–REVISEDagain

AP Physics 1 syllabus-Waves-B day–REVISEDagain


Tutoring Schedule n10

And now, introducing the reason for my absence…the very first baby boehr: Raynes Alice



Baby Boehr--2-20-2015


Prosper High School UIL Invitational Results

Thank you for attending the PHS 2015 UIL Invitational Academic Tournament.  We hope that you will join us next year.

  • Academic Champions “Sweepstakes”: McKinney High School
  • 2nd Place Academic Team: Liberty High School
  • Top Journalism Team: McKinney High School
  • Top Speech and Debate Team: Gainesville High School

All Academic Contests:
PHS Invitational 2015 Score reporting sheet ALL contests

Speech & Debate Results can be found on the Joy of Tournaments website.

We will do our very best to get outstanding medals and test materials to your respective campuses if they were not picked up.  If you wish to stop by the school to pick up materials we would appreciate it.  Please let me know your preferences.



AP-C: Statics Review KEY

Ap-C Statics review KEY


AP-1: Solutions/KEY to centripetal force quiz

AP-1–KEY–Centripetal force


AP-C: Gauss’ Law Quiz key

AP–KEY–Gauss’ Law


AP-1: Momentum test results and improvement opportunties

Test results from the momentum test were somewhat disappointing, in fact generally lower across the board that many of your performances leading into the holiday break.  As I say this, please note that some of you did very well, and I noted several students who beat the class average for the first time this year.  Good job!

That said: 1)This was a very moderate exam by any objective standard. 2) Many of the most commonly missed items were things that really should not have been missed, revealing a lack of diligence on your part.  That’s harsh, but frankly, this one is on you.

My analysis of the most commonly missed items on the test show that students performed very poorly on the lab analysis questions (You did do the lab, right?  You didn’t just copy someone else’s work?  You know how to interpret a velocity vs. time graph?) and failed utterly at the use of the delta operator where negative signs were involved.  For many of you the questions pertaining to just these two topics constituted the majority of your points deducted.  Finally, many of you are still failing to recognize circumstances where Newton’s 3rd Law is at work.  Remember that discussion from the final exam?  All those questions we dissected the other day?

I am giving you each an opportunity to earn back some credit and learn from your mistakes in the process.  Each student will be eligible to earn back up to 1/3 of the points lost on the exam. Note the word “earn.” To participate you must:

  1. Attend a tutorial session between now and the end of school Tuesday, Jan. 27.  My schedule is below.
  2. At the tutorial you will be given your scantron and a blank test.
  3. By yourself, using only your notes, your brain, your online textbook and/or the one of the class set of books in my room, you will write up full and complete corrections for every missed item on the test.  I will regrade your work (this may take some time to make it in the gradebook) and award you a proportionally correct amount of credit back, up to 1/3 of your missed points, with a max of 20 points.
  4. It will remain silent in my room while this occurs.  If you wish to employ my services on a question, you will lose the opportunity to earn back credit on that item (but it may help you get others correct–you need to weigh the benefit).

A strong caveat: Do not put this off.  There are only 26 seats in my classroom and I will only allow 26 students at one session.  If you wait until the end, you may be turned away.  First come, first served.

Mon. (1/19) No School No School



Wed. (1/21) 7:40 3:30 – 5

In Library

Thurs.(1/22) 7:40 After Duty (4pm)
Fri. (1/23) 7:40 None


Mon. (1/26) 7:40 3:30 – 5
Tues. (1/27)


3:30 – 4:30

Wed. (1/28) None 3:30 – 4:30
Thurs.(1/29) None Duty (None)
Fri. (1/30) None None


AP-1: Momentum HW #23

#26: This is your challenge problem and it is very hard, possibly beyond many of your abilities.  Do not fret!  It’s a bonus! Also, I cannot imagine a question this difficult, using the required knowledge base on your AP exam this spring.

This is a great question, and, I think, very much AP like in that it requires you to apply lots of different physics to solve the final part of the problem.

The diagrams in Figure 9-13 show a brick weighing 24.4 N being released from rest on a 1.00 m frictionless plane, inclined at an angle of 30.0°. The brick slides down the incline and strikes a second brick weighing 35.8 N.

There are actually three parts to this problem.  1) Sliding down the ramp.  2) The inelastic collision between the two objects.  3) Sliding with friction, coming to a stop.

Part 1)

You must apply your knowledge of ramps/inclines to find the speed of the object as it reaches the bottom of the ramp.  This “final velocity” will serve as object 1’s initial velocity during the collision.

Part 2)
You must perform a conservation of momentum calculation on the inelastic collision, using your solution from part 1 as your initial velocity.  You are looking for the final velocity of both (they move together, it’s the same) after the collision.  This final velocity will become the initial velocity in part 3 (see a pattern, yet?)

Part 3)
You need to assess with Newton’s 2nd Law.
{F = ma   only force is Ff and is back/negative
-Ff = ma   Mass is combined mass, a = (delta) v/t
You know the initial velocity is the final speed from part 2, and the final velocity here will be zero (it comes to a stop), Ff = mu*N, N=(m1+m2)*g
Solve for t
Use t to find x by kinematics

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