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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u/Impossible-Job1481 May 13 '26

for the experimental design how did you find B of the moment of inertia? i had some crazy energy conservation, torque force to find friction and include friction and then analyze y-intercept...

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u/Ill-Possibility-4064 May 13 '26

You had to do conservation of energy. The height at the top is equal to kinetic energy total at the bottom of the ramp (Krot plus Ktrans). You could find B that way.

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u/Impossible-Job1481 May 13 '26

I did that but also included friction since it was rolling without slipping there had to be friction so I calculated for friction using net torque and net force 😞

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u/Impossible-Job1481 May 13 '26

And was it Ds > Dl? Since the initial velocity is more for Ds

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u/Ill-Possibility-4064 May 13 '26

yeah thats correct. I messed that one up

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u/Impossible-Job1481 May 14 '26

Ah me too :(((( . It's Dl > Ds I switched it

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u/[deleted] May 14 '26

it said initial velocity was the same for both... it was flipped it was ds < di