2024 AP Physics C Mechanics Set 1 Free Response Solutions

Walkthrough of the 2024 AP Physics C Mechanics Set 1 FRQs

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[neilaraujo]

16:14 is the drag force not equal to bv^2 or is it bv? Edit: Just saw you corrected it lol

[bomboclat-pie]

at minute 25:19 question 3 a do we have to put that force of the pivot or is it fine if we just leave it alone.

[idontknow]

Could u tell me why the graph was upwards for t2 and not downwards? Is it bcz of stable equilibrium? 9:00 ?

[vivipettiss]

I was freaking out over the exam then it turned out the practice problems we did in class were much harder than the actual AP FRQs. Only checked all videos of released past FRQs a day before the exam. Heart attack somewhat averted.

[imnotlagging]

for 1b(i) on the t2-t3 section wouldent it be decreasing the kenetic energy because its past the equilibrum point? spring potential increases?

[ihatekitcat]

Could there have been different answers for 2e. I put velocity vs time and then said to conduct separate tests with each varying length to see how that would affect terminal velocity. Is this right??

[krishnaperla]

for 3d ii why would it not be parallel axis theorem since its asking for rotational inertia around pivot point not center of mass? I didn't know how to do it I just put the parallel axis theorem down hoping to get a point

[amanshastry]

For FRQ 1 (b) (i), I drew a graph that looks like a sine graph (without a point of inflection, only concave down), as K = 1/2 * m * v^2 and argued that x is proportional to cos(t), so v is proportional to sin(t). So, shouldn't the first part of the graph look like a sine graph without a point of inflection? If not, could you please let me know how many points could be taken off? Thank you

[levoir]

I surprisingly got most of these right despite not even being in an AP physics class…I’m so lucky

[IBPhysicsTutor]

Question: for Q3(c), wouldn't the answer be more information is needed? since the information on how what angle the rod will be elevated is not specified, we can't deduct whether the tension is greater or less. Since the torque is calculated from the formula: Frsin(theta), if theta is smaller than 90 degrees, then the tension would definitely be smaller than before, but if it were greater than 90 degrees without any specificities, we cant determine if the tension is greater, smaller, or equal to the tension before.

[Gabe-eicz]

Question 2a has to have bv^2 subbed in for drag not just bv great review😊

[kaustavkapur]

For question 3a on the free body diagram, I labed Force axle as F normal. Will I lose points. Additionally, the angle of the force vector is the same angle as the rod. Will I lose points, or was it supposed to be a greater angle?

[amerkabrit]

Hello
I have a question, my students are claiming they have been examined in a test which is different than sets 1 and 2
Would that be possible?
Is there a version that is not published?

[kaustavkapur]

For question 2e, will I lose points for plotting Vmax^2 instead of Vmax on the vertical axis?

[abassi]

For frq 3 b how was the tension at cos theta? The tension looked like it was already acting completely perpendicular

[aryag]

can you use net force in the x and y directions equal to zero to solve for tension? i solved for the force of the pivot using net force then used that to solve for the force of the tension also using net force? I drew the force of the pivot acting in the direction of the rod, is that right?

[lokibricks]

for the line of best fit, how can an object that has a mass of zero have a non zero terminal velocity? Like why is there a y intercept that isn't zero

[ZivoTBG]

Do you think I would lose my point on question 3 part (d)(i) for not putting units? I had the correct number, I just didn’t put kg for some reason…

[andrew_dd]

question can u take our an x from part a i in question 1?

[PearJamm]

For question 1b wouldn't the kinetic energy drop right at t3 since there is an inelastic collision?