Needed 25/35 and 25/45 on frq to get a five.
I think i got 30/35 on the mcq. It was super straightforward and had clean answers, if that makes sense.
Frq was good. I did the first one last week, the same problem pretty much. Second one was good. I called it. Third was hard but doable since both frqs before took less than 15 minutes.
Do you think conceptual questions (on the FRQ) are going to be work a lot of points? Over the calculuations? From previous years they seemed to be worth only 2 points each.
Was I the only one that thought the 1st FRQ for mechanics was pretty hard. I couldnt figure out like part c and d
I think my answers were:
m = 0.48 kg?
c. just read the graph (where ever the F = 0.45 N
d. find the velocity and use the friction force (horizontal intercept) to determine the t (t = mv/f)
ya I wasnt sure how to get the mass since the graph only showed the pulling force not frictional so i couldnt really do the last part
Does AP Physics C align with what is on the SAT Physics Subject Test? I was told that AP Physics 1 didn’t cover the subject test material, and I’m trying to figure out which AP does.
No
None of them. Per the [College Board](http://media.collegeboard.com/homeOrg/content/pdf/teachersguide-to-the-sat-subject-tests-in-science.pdf):
and
In other words, you need a HS course, not an AP course, or else you will have to study a lot of topics on your own.
Is there anyone who posts answers to the Physics free response? like “askmrcalculus” does for Calc AB/BC
Since the 2016 free response have been released, these were my answers for Mech. 3 (very lazy, condensed format, unsolved stuff):
a) Sum of centripetal forces equals mw2r , only force is kx, x=d/2, r=2d
b) i. point particle, I=m*4d2
ii. I = Iparticle + I platform + I rod and then use relevant moment of inertia formulas and plug in for their masses, R, l
c) Whatever you got for I in bii (I think I got 15md2?) multiply it by omega, so 15wmd2
d) sum of Fc = mw2 r
kx=mw2 (d+x)
Solve that for x
e) Decreasing because moment of inertia is decreasing while omega is constant, L=I*w
f) Negative work, KE rotational is decreasing
g) Wasn’t sure, put it in Quadrant 4 (down right / south east)
Indeterminate, here’s what I think about 3g.
v=wr, so as r decreases and w remains constant, v decreases. This means that there is tangential acceleration to the right.
There is also acceleration radially inward, so overall the acceleration would point down and right.
Hopefully that makes you feel slightly less panicked as you wait for the arrival of your scores. 
Is it necessary to have AP physics 1 before taking this class? I was placed in AP physics C because of my math level, but most of the kids in it will have already had AP physics 1. I’ve only had regular physics and it was a few years ago…
That’s fine, and IMO, better. Regular physics covers a wider range of topics than AP Physics 1, so with some topics, you’ll actually be better prepared. Remember, this is only the second year of AP Physics 1; thousand upon thousands of students took Physics C successfully in years prior without an previous AP course.
How are you guys feeling about scores tomorrow ?
Got a 5 yo
Double 5s!
double 2s!!!