2024 AP Physics 1 Free Response #2
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- Опубліковано 18 тра 2024
- Walkthrough of the 2024 AP Physics 1 FRQ #2
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Corrections:
Part C
ii) Misread the time. It was to 2.5 s which the area would be 0. And then part iii) the area and velocity would be consistent because the area shows 0 change, and the velocity is the same at both times.
Pheww slay I did that okay
I did the same thing on the real exam.... rip
@@nextmb1551 I bet you lose at most 1 point (or even 0) as long as you demonstrated the right skills
@@AllenTsaoSTEMCoach Well that's good! Do you know when does College Board releases the scoring guidelines?
@@nextmb1551unfortunately it's after the scores are released
For part c ii and iii, the time is from 0.5 to 2.5, so the change in momentum should be 0.
Thanks for catching that! Just made the correction in the pinned comment.
Got destroyed on this question. Did not expect the 4-6% period unit to be on there twice.
yeah I didn't even study that unit🥲
Hey I believe you misread the question...Isn't the change in momentum zero as it asks for the time 0.5s-2.5s?
Could I have gotten the graph question right if I said root mass times 2pi is the y variable??
I forgot to use period but I used kg times time squared, which is the unit of the spring constant. Will that work? My slope for the graph is (weight/(weight/kg times time squared))
for part c 2, you calculated the impulse from 0.5 to 2 seconds instead of 2.5. I think its supposed to be 0.
WAIT REALLT? I got that right thank god I was so scared
@@ethan93934 same bro omg
How many points do you think part a and b are worth. I completely forgot the period equation and skipped that part
Ok, for part a, I didn’t see that we had to list the procedures BELOW THE TABLE, so I just listed my procedures in the white space under the question. Would I still receive credit for labeling my procedures right , or am I going to lose points on that?
I did that too 💀
ME TOO 😭😭 CAN WE STILL GET POINTS???
It should be fine as long as your answer is in the booklet. I've never actually sat down to grade exams but they would probably check the entire portion of the FRQ response for your answer
So I did everything else correct but for my table instead of listing Period and the symbol as T, I said time and the symbol as t. Would that count against me since I said the time would represent one oscillation of the spring, but technically I should've called it the period instead. I think at worst it'll be 1 point off out of the entire question, so 11/12.
For the slope of the graph question, I put T^2 and M. Would that be a correct interpretation for finding the slope?
Yeah anything where the coefficient of the horizontal variable is a constant and contains k is fine. As long as you explain how you calculate k from the slope for part b ii
How many point would I lose if I accidentally put measure the mass with the stopwatch and period with the scale because I think I didn’t see that 😭
Will I lose a point for not saying pull and release in the experimental design? I assumed adding a mass to the spring would add a downward force due to gravity which would displace the cylinder from equilibrium and cause it to oscillate anyways
It should be fine. They grade it in the context of what you are saying. It has to be easy enough to understand but doesn't have very specific things about the exact procedure.
On the experimental design question where you are making a procedure, they give you a digital scale. How do you measure a mass with a digital scale? Doesn't a digital scale measure weight in this case? So you would do W=mg and solve for m?.
most lab digital scales are capable of measuring mass. if u said to do this, then ur not wrong either
how many points do you think i would lose if i added a meter stick and then solved for displacement,time,and mass to solve Fnet? (since fnet is kg*m/s^2) I also said to find the spring constant to so Fnet/displacement to find it. Then i put Force(N) and displacement(m) in the vertical and horizontal axis since the slope is equal to K
Did the exact same thing bro that’s crazy. I think you should definitely get partial credit even if it wasn’t what they were aiming for
I DID THIS TOO
me.
I did the same thing 😭😭😭
Part c it said 0.5s to 2.5s so wouldn’t it be 0 ?
Heheheh so my apph 1 teacher doesn’t teach and didn’t know we didn’t have to fill out the 3rd column in the experimental design materials…. So I filled it out with stretch distance and used that to design an experiment for the K as opposed to period… and I didn’t read we didn’t have a materstick… how many points will I loose?
I did the same thing 😭😭
I used hookes law to find k
Does allowing to oscillate multiple time and taking the average get you the points for reducing experimental error
I'm not totally sure. I could see an argument made for it even if it's not the usual method.
Hi, for part b, if i did T^2 (y) vs mass (x) and said my slope would be (4pi^2)/k and then rearranged to solve for k: k=(4pi^2)/slope, would that be correct?
wait i did this too. pls let me know if someone answers!
Yes that would be fine.
Will i lose pints for saying to use stopwatch to measure the period without mentioning oscillations or multiple trials?
Usually you lose a point for not trying to reduce uncertainty. Multiple trials is the easiest way to do this.
And for part b can I put vertical as mass and horizontal as period^2 and in b ii indicate k will be slope* 4pi^2?
that’s exactly what I did! I hope
yes that would be fine.
Also I believe you accidentally did the change in momentum up until 2 s when it was 2.5 s. Wouldn’t it just be zero kg m/s?
oh a lot of people have been saying that my bad
@@charlesgorblek3077 no worries! I know you all will catch me on stuff like that 😂😂
Does Collegeboard release the FRQ questions for the AP Physics "Late-exam" ?
no they don't
Would I lose points for not putting the .01125 as a negative value?
I'm not sure how picky they will be on this. I would hope not, but I'm not totally sure.
Bro i added ruler to measure the displacement of the spring in the third row and did k = x \ f looool why did they add a third row
I did the same thing lmfaooo
I just realized I did all my work outside the box underneath the text because i didnt read the line where it said put your work in the box 💀
me too i’m so scared
12/12 !!
Does a digital scale measure mass or weight? I thought scales measure weight
It will measure both. It knows what 9.8 is so it can convert to kg automatically.
@@AllenTsaoSTEMCoachis it wrong to say it measured the weight and then in the procedure say to convert to mass then?
@@user-xs3se1sd7n no it's not wrong to say that. Just not really necessary.
so close to having perfect but missed ci 😭😭😭
I believe you skipped b ii
That question was weird would the answer just be that the slope of the line IS the value of K? Question is kinda redundant
@@tripdeck5698 yeah it kinda was. For b i, I made the axes not take the 4 pi squared into account so for b ii i said k would be slope times that
@@charlesgorblek3077I included 4pi but I swapped T^2 and M so my x axis was M and my Y axis was 4pisquaredTsquared
Yeah I should have written the slope would equal k
Why did they have that extra column if we couldn’t use it smh
Nah Wrd, I added a meter stick and did F=kx to find k
Fun stuff! I just finished with college level Calculus based Mechanics, and I think your part C (ii) response is potentially a bit misleading. The force in this problem is not constant over this interval, so you cannot simply use that Impulse or Change in momentum is the force*change in time directly since you need a constant force to plug into that formula. The more appropriate answer would be to integrate force with respect to time from t1 to t2. This problem has to work out though for an algebra based class and that is why the positive and negative area has to cancel due to symmetry. So even if the problem was written on the interval you originally solved for, representing as a triangle with a linear hypotenuse would still not yield the exact area under the curve.
AP physics 1 students are not expected nor allowed to use Calculus to answer these questions
It also says to *estimate* the answer. It is not required to have an exact answer.
@@AllenTsaoSTEMCoach True, and I totally understand! Just kind of a sneaky question when you look at what is going on. Estimate is a good way to word it to also get around the calculus.