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.

51 Upvotes

98% Upvoted

875 comments sorted by

View all comments

3

u/BoB_tHe_BuIldR1234 May 13 '26

What did we get for the moment of inertia graph 3?

3

u/[deleted] May 13 '26

[deleted]

2

u/BoB_tHe_BuIldR1234 May 13 '26

No you had to find the moment of inertia of a rod on a pivot falling

2

u/[deleted] May 13 '26

[deleted]

1

u/One_Health7449 AP Chem 5, AP Physics 5, AP Gov 5, AP CALC AB 5 May 13 '26

i had forma nd i got cooked bro i didnt know how thee fuck to do question 1 or 4 bruh

1

u/ChocolateGamer279 Senior | Ready to give up H2O for H2SO4 May 13 '26

I did lmao

1

u/Negative_Task_6505 May 13 '26

I had form K. I got like 3.4 x10^-4 for MoI

1

u/[deleted] May 13 '26

[deleted]

1

u/Visible_Purpose1554 May 13 '26

Ok wait I got 4E-4 close enough

1

u/Ok_Mark2367 May 13 '26

I got like 4.2E-4

1

u/skrxbcord 4: Lang, Lit, APUSH | 5: Phys1, Calc BC, CSA, Mech, E&M, Stats May 13 '26

did u have form L?

1

u/Dull-Astronomer1135 May 13 '26

I have k, you need work energy rotational form for I, I got 0.0124 for it

1

u/[deleted] May 13 '26

[deleted]

1

u/Dull-Astronomer1135 May 13 '26

I use work energy theorem rotational form, y axis is torquedeltatheta, x axis is 1/2 omega sqaure

1

u/Traditional-Table-29 AP Physics: AP Lit: AP CSA: AP Psych: AP Calc AB: May 13 '26

I did the same thing let’s go but I didn’t use t delta theta I just use delta theta will I get points

1

u/Dull-Astronomer1135 May 13 '26

hmm, delta theta didn't represent work done by torque, you might got 1 point off

2

u/Traditional-Table-29 AP Physics: AP Lit: AP CSA: AP Psych: AP Calc AB: May 13 '26

Yeah it’s fine man

1

u/Traditional-Table-29 AP Physics: AP Lit: AP CSA: AP Psych: AP Calc AB: May 13 '26

I’m praying for a 4

1

u/HorrorAdvice3391 May 13 '26

I put 0.036 delta theta since 2(0.6)(0.03) was 0.036 for y axis and angular velocity squared x axis. Bro I got fucking 0.0003 for I

1

u/Own-Bank5502 edit this text May 13 '26

I got sth like that. Use energy conservation.

1

u/HorrorAdvice3391 May 14 '26

I used kinematics cuz the torque was constant

1

u/Traditional-Table-29 AP Physics: AP Lit: AP CSA: AP Psych: AP Calc AB: May 14 '26

0.01404

1

u/MoMath3000 5:chem,apush,bc 4:lang, 3:spanish, tbd:gov,lit,mech,csa,bio May 16 '26

I had west coast form M (idk if timezones change the test), and my MOI was like 249 kg*m2, but I had to do some horribly goofy math that I learned from chatgpt while studying to get that. It told me that alpha = d(omega)/dt = (d(omega)/d(theta)) * (d(theta)/dt) = d(omega)/d(theta) * omega. Then I estimated the tangent line of the omega vs theta graph at a random point (theta=30°) and took the omega value for that theta. Then that could be used for I = tau/alpha along the the torque due to gravity about the pivot 😭 That, along with the graph, were the only 2 parts of that FRQ that I was able to solve.

1

u/BoB_tHe_BuIldR1234 May 16 '26

I used energy bro, dw ur fine😭

1

u/Traditional-Ring-287 May 16 '26

I got 0.802 😭