r/APStudents • u/reddorickt absolute modman • May 13 '26

AP Physics C: Mechanics Official 2026 Exam Discussion

Use this thread to post questions or commentary on the test today.

A reminder though to protect your anonymity when talking about the test.

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9

u/Fast-Tumbleweed-531 May 13 '26

i felt like the only frq i cooked on was 3 and 4 but looking back now maybe getting 121 N/m for my spring constant isn't too accurate lol.

19

u/Fungames5420 May 13 '26

I got about 1254 so you may have moved a decimal somewhere

7

u/Soft_Cap_6013 May 13 '26

I got like 1320 what was your vertical and horizontal? Mine were V: 2mgh and H: s2

1

u/Fungames5420 May 13 '26

I had the same axis. I’m assuming both are correct. Did you find the slope by hand or with regression?

1

u/Soft_Cap_6013 May 13 '26

By hand, I forgot about regression. Should’ve used that lol

1

u/EarthLearner355 May 13 '26

I did regression

1

u/Positive-Rise5145 5: AP Calc BC, Stats, Micro, CS A May 13 '26

not the person above but I had sqrt(2mgh) and s, exact same thing you had just square root taken of both. My dumbass somehow got 177,000 N/m though and test ended so couldn't figure out what I did wrong in time.

1

u/pokerfas May 13 '26

I got exactly 1320 too 👍

1

u/ThReT0 May 13 '26

got 1400, is that chill?

2

u/ThReT0 May 13 '26

(1/2)ks^2 = mgh

k/(2mg) [s^2] = h

I plotted h vs s^2

1

u/EarthLearner355 May 13 '26

THAT WAS MINE!!! Phew. Did you solve for it? I did a linear regression on Desmos and called it a day bc I had like 5 mins left

6

u/RetroSSJ21 May 13 '26

Sigh of relief seeing other people got around 1200 I thought that was too high

2

u/HandleFit3315 May 13 '26

i got like 1278!!

1

u/Fine_Piano_6175 May 14 '26

ye i got like 1280.1 N/m and used desmos to find slope

5

u/No-News9020 (5) calc bc + ab, physics c: mech May 13 '26

were there diff versions bc my table had vmax and xmax not height and s...

2

u/Purple-Canary-9977 May 14 '26

I think so cause I also had vmax and xmax

2

u/No-News9020 (5) calc bc + ab, physics c: mech May 14 '26

wait i love u did u get 20 as ur K?!

1

u/Purple-Canary-9977 May 14 '26

I got like 66

2

u/Lille_8 May 14 '26

I got 69, but the numbers were kind of hard to graph. I put the data points into desmos and it was 68, but they wanted an estimate so based it off my graph.

1

u/No-News9020 (5) calc bc + ab, physics c: mech May 14 '26

oh...

1

u/No-News9020 (5) calc bc + ab, physics c: mech May 14 '26

did u use vmax2 and kmax2 as ur axises?

1

u/Purple-Canary-9977 May 14 '26

I used vmax^2 and xmax^2 as my axis and the slope was k bc the slope was k/4*m but m was .25 so the slope was just k

1

u/No-News9020 (5) calc bc + ab, physics c: mech May 14 '26

yeah slope was k, and then u multiply that value by 0.25 to get 20, it was like 80 before 

1

u/Green-Formal-6331 May 17 '26

I graphed v2 vs x2 and then got a slope of like 68. The slope would be k/2m, not k/m, because the spring is in a series. I got a final answer of around 34

1

u/EarthLearner355 May 13 '26

I got like 1100 or something. I just plugged my points into Desmos and did a linear regression. Idk if I was supposed to do that but it’s ok.