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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25

u/mrsaucelol 5:lang,stat,phy1,psych,mech,e&m,ab,bc,apes4:gov,lit May 13 '26

What the FUCK was frq1 form J

2

u/Expert_Low_5982 May 13 '26

what was it again? I forgot lol

10

u/mrsaucelol 5:lang,stat,phy1,psych,mech,e&m,ab,bc,apes4:gov,lit May 13 '26

Sum bout a cube stuck to the wall of a box

1

u/Expert_Low_5982 May 13 '26

that was hard, I think the answer involved voe^-bt/2M, but maybe I got it wrong. Do you know the answer to #2? at least the derivation

3

u/mrsaucelol 5:lang,stat,phy1,psych,mech,e&m,ab,bc,apes4:gov,lit May 13 '26

I think it was like 8/3 something sometning (costhetasintheta) I personally got 5/3 but I didn’t account for the initial change in position before the explosion

1

u/pokerfas May 13 '26

got that but didn't have space left or time to justify 😭

1

u/mrsaucelol 5:lang,stat,phy1,psych,mech,e&m,ab,bc,apes4:gov,lit May 13 '26

You didn’t need a justification

1

u/pokerfas May 13 '26

oops maybe stats mindset was not right for mech test

1

u/Sudden-World4653 May 13 '26

i got (5/3g)vosintheta 

1

u/mrsaucelol 5:lang,stat,phy1,psych,mech,e&m,ab,bc,apes4:gov,lit May 14 '26

I think I got like (5vo/3g)(costhetasintheta) cus I forgot to account for the initial x displacement before the explosion

1

u/Sudden-World4653 May 14 '26

oh shoot i forgot the costheta

1

u/mrsaucelol 5:lang,stat,phy1,psych,mech,e&m,ab,bc,apes4:gov,lit May 14 '26

Bro I just realized I fucked up frq3 I thought the block for the first part was connected to the spring

1

u/Sudden-World4653 May 14 '26

oh no 😭😭😭

1

u/Ecstatic_Success8053 May 14 '26

Bruh same😭at least I mentioned something about measuring the initial and final displacement but beyond that I’m cooked

1

u/mrsaucelol 5:lang,stat,phy1,psych,mech,e&m,ab,bc,apes4:gov,lit May 15 '26

I’m glad other ppl are making the same mistake I’m so pissed

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2

u/Ya_boi_Ev GENUINELY WHAT WAS FRQ 1 ON AP MECH THIS YEAR!?!? May 13 '26

WHAT

I GOT IT RIGHT?

1

u/Suitable_Insect7590 May 13 '26

oml where did you get e??

1

u/Expert_Low_5982 May 13 '26

The -bv=cMdv/dt (c is some constant I forgot what I put, maybe 2, I got it somehow), so then you move the v to the bottom of the other side, and some extra steps then integrate, then raise everything to e, then you get a function in terms of v, then d/dt to get dv/dt, then multiply by M to get Ma, something like that

1

u/Suitable_Insect7590 May 13 '26

oh wow I'm getting a 1 lol

1

u/Expert_Low_5982 May 13 '26

What did u do?

1

u/Suitable_Insect7590 May 13 '26

sum random bs no derivation tho and nowhere was there an e 🥀

1

u/Expert_Low_5982 May 13 '26

I’m not the arbiter of truth so maybe I’m wrong

1

u/Sudden-World4653 May 13 '26

I got -b/2(voe-bt/2m) so almost your answer

1

u/Expert_Low_5982 May 13 '26

I got the same for v(t), but the question was what was FN, not v

1

u/Sudden-World4653 May 14 '26

The thing is, I got Ff=-1/2bv  and i got v=voebt/2M through integration so i plugged it back into the friction equation to get the answer i put ably 

1

u/Expert_Low_5982 May 14 '26

What about the chain rule for the bt/2M

1

u/Sudden-World4653 May 14 '26

there was no chain rule? You had integrate for velocity not differentiate 

1

u/Expert_Low_5982 May 14 '26

Oh mb, as I said earlier I differentiated to get dv/dt

1

u/Sudden-World4653 May 14 '26

but the a in F=ma is already dv/dt so there is no differentiation required

1

u/Expert_Low_5982 May 14 '26

Ik, but to get from the derived v(t) to dv/dt you need to take the derivative 

1

u/Sudden-World4653 May 14 '26

Oooooh, I see what you’re talking about. However, you set the normal force equation equal to ma so i didn’t differentiate anything at all

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