<p>What forms did you guys have? I had form E…</p>
<p>Form O</p>
<p>I HATED thermo the whole year, but I studied it right before the exam. Compared to what they could’ve given you, (PV diagrams), the thermo FRQ was easy. All you needed was U = Q+W</p>
<p>Also, no double slit stuff! Yay! The quantum FRQ was very easy, just some subtraction between energy levels and stuff. </p>
<p>The MC section had its hard questions, but, compared to the practice exams I took, I think it was easier than usual. Unless there were a lot more trick questions that I could tell…</p>
<p>A lot of people had Form E. Or at least compared to other AP tests for this year</p>
<p>Are Forms O and E the only two?</p>
<p>No, those weren’t the only forms because half of my class had form G, and half had O. Just to clarify, I’m not international.</p>
<p>I found the test to overall be pretty difficult. I got 5 on all my practice tests too.</p>
<p>FR i knew 4 of them for sure. Maybe 5 but not sure.
Thermo one was easy.
Spring one was easy.
Refraction one was easy for me.
The magnetic current one got me in 2 or three of the parts 
Never seen that twist before!
The one mechanic one with the pulley also got me unfortunately. Also I think i messed up some on the Nuclear Physics.</p>
<p>MC was very hard. Not many proportional questions, a lot of calculating questions. I knew how to do all them but calculating with actual numbers (especially in E+M) is just a pain. they should do more conceptual questions and proportional reasoning than plug and chugs IMO. </p>
<p>Think I got a 5 though 
Guess at this point it depends how all you chumps did (hope you all got 5s)</p>
<p>For refraction I got index of refraction = 1.26 for plastic…</p>
<p>The magnetic current one was the one I struggled with. How on earth is there induced emf if a straight wire moves up and down?? It has no enclosed Area, and flux = BA</p>
<p>I just left that one blank, but I guessed that the right side of the wire has higher potential.</p>
<p>I thought that the test was fair, even a little on the easy side. My AP teacher only taught the material on 2 of the FRQ questions, so I had to learn most of it myself.</p>
<p>The MC sections was fairly easy. The questions were straightforward, and even the ones on topics I hadn’t really learned in depth were manageable. I expected more kinematics and mechanics problems, especially since most AP courses tend to emphasize those topics. I was also surprised by the number of “double this, halve that” questions. </p>
<p>The FRQ was a bit harder, as I mentioned earlier, because I had to self study most of it. I was fairly shocked to see 2 problems involving mass on a spring (both horizontal!), especially since there are so many other topics that could be covered (eg: modified Atwood machines). There were definitely those questions that separate the strong students from the weak. But on a whole, it was fairly good. The thermo was easy if you learned it right.</p>
<p>It seems that AP Physics teachers are not great across the country. Why is it so hard to teach? I think there is too much material (which is why they’re splitting up this test after next year into 2 tests), and AP classes are now (at least at my school) filled with students who want a GPA boost, not the hardworking people who would do well and are able to learn quickly. There were maybe 10 of us who actually tried in my class, but my teacher wasn’t so great. Out of 80 students in the course, 14 took the test.</p>
<p>Will both Form E and Form O questions be posted in 2 days?</p>
<p>No, only one set. My guess would be that the Form O ones will be posted.</p>
<p>@BurnOut, that’s what I thought too! I just had no idea. I was about to put zero, but I thought it couldn’t have been a trick question.</p>
<p>I left the entirety of problem 7 blank. We never got to quantum…</p>
<p>OH NOOO!!! I understand the E&M one now!!!
stupid stupid stupid sum of forces ughhhhhhhhhhhhhhhh</p>
<p>??? Are you talking about the parallel wires, @yayitsme?</p>
<p>If you understand the part about its flux and induced emf, please enlighten me.</p>
<p>pm’d you :)</p>
<p>I realized that I made some dumb mistakes on the FR section after looking through them again (forgetting to label tension on the free-body diagram, having both graphs be incorrect on the spring problem because I didn’t notice ‘oscillating’), though I think I got maybe 15 points off at most on the FR. The parallel wire problem was tricky until I realized that they were vertically arranged, meaning that they were under the force of gravity. I thought they were on a table or something when I first read the problem.</p>
<p>For the 2 graphs in the oscillating horizontal spring, this is what I got. Tell me what you got:</p>
<h1>1: KE vs displacement: Kinetic energy was an inverted parabola that was highest @ 0</h1>
<h1>2: Acceleration vs displacement: Acceleration looked like the graph of y=x^3, if you know what I mean. Like a parabola with one side flipped over the x- axis. Because the acceleration points in different directions depending on which side the mass is.</h1>
<p>Here are my solutions to the free response questions (all parts except 3c and 6eii, wasn’t too sure about those for some reason). Feel free to comment with any questions or disagreements you may have. <a href=“https://docs.google.com/document/d/1k1ahICGjaAGR5M4etnkMWHpM6ax6xksX7EDm9aRN3W4/mobilebasic[/url]”>https://docs.google.com/document/d/1k1ahICGjaAGR5M4etnkMWHpM6ax6xksX7EDm9aRN3W4/mobilebasic</a></p>
<p>They look right mostly right, (as in, they coincide with what I got). Except for a couple:</p>
<p>3e: the KE one looks somewhat like a cosine wave, since it is oscillatory (SHM), it is sinusoidal. The acceleration is like a sine wave - starts +, ends -.</p>
<p>6b: I didn’t realize this at first, but there is an equation i found at [Forces</a> between currents.](<a href=“http://hyperphysics.phy-astr.gsu.edu/hbase/magnetic/wirfor.html]Forces”>Forces between currents.) to get it. I put what you put, so hopefully they’ll accept both answers.</p>
<p>7c: ionization energy is the first ionization, so from n=4 to n= infinity. That is, I believe, 19 eV.
7d: I thought that it would move it to n=2, since it has enough energy to make that phase change but no more. My teacher never taught this, so I self-studied it.</p>
<p>For 7, I thought the difference between n=1 and n=2 was 9 eV</p>
<p>@Benjineering, I got the same thing for c, 11 eV was enough to excite it from 12.0 to 3.0 which was a difference of 9.0 eV, less than 11. I wasn’t sure about part e, I said that it would excite the electron “to the infinity energy state” so I probably didn’t get points for that haha</p>