I forgot to talk abt the intercepts for the first but talked abt how it’s conserved and no external forces r acting on the system and therefore all the energy will be converted between the two and that’s why it’s the same value will that work
Having this video definitely boosts my confidence for the exam grade. For part B, I too got 1/2 but all of my friends got 2 so I felt like I messed up an easy problem. On this particular problem I now confidently know I got all but the graph correct (I made the kinetic energy 2 rather than 1 because I though you had to half it). Is there a video talking about the mcq or is it even released yet, because I felt like that was the most challenging part of the exam and I’m interested to see how I did. Btw, 45% of those who took the exam this year passed with a three or above based on current grading.
For part b, I did it differently to get the same answer. I basically said T = D/V, and found the v using conservation of energy, and said that the distance d is the same, finding an equation for time. T =1/f, and since i knew what time was, it was easy to find the frequencies, and I found f2/f1 to be 1/2. Is this correct?
For part c-i I had a totally different answer but I think mine could plausibly also be right. I said that the 3m block multiplied the oscillating mass by 4 and, because the frequency ratio of 1/2 meant doubling the period, that the average velocity would be halved. Since 1/2(4m)(v/2)^2 = 1/2m(v)^2 I said that the kinetic energy would end up the same and therefore also potential energy since the law of conservation would still apply. Would this be a valid alternate answer and get full points?
For question c ii, do I have to explain how I got the graph, because I didn't put anything explanation but got the graph right (it didn't say I have to justify my answer in the question)
For which part? From an energy point of it, it doesn't really matter if you include it because the wall doesn't do any work anyway (displacement is 0 for the wall's force)
Part c severely messed me up. I was so confused how total mechsnical energy could possibly be the same. Because if you have more mass you will always have more kinetic energy. But i guess not in this case 😢
Lmao I messwd it up so badly. First, I thought the block is 2m, second I forgot there is a sqaure root sign when I was simplifying. I ended up with 1/3
Sir I just recalled that i took form I instead of form O. According to your experience do college board release form I as well or do they release form O only?
I confidently answered all of those questions completely inaccurately
I forgot to talk abt the intercepts for the first but talked abt how it’s conserved and no external forces r acting on the system and therefore all the energy will be converted between the two and that’s why it’s the same value will that work
Yes, as long as you mentioned conservation of energy.
Having this video definitely boosts my confidence for the exam grade. For part B, I too got 1/2 but all of my friends got 2 so I felt like I messed up an easy problem. On this particular problem I now confidently know I got all but the graph correct (I made the kinetic energy 2 rather than 1 because I though you had to half it). Is there a video talking about the mcq or is it even released yet, because I felt like that was the most challenging part of the exam and I’m interested to see how I did. Btw, 45% of those who took the exam this year passed with a three or above based on current grading.
They never release the MCQs
Damn I totally guessed for the drawing part
me too but i got it right l
maoo
Would I get any points if I went from (5,0) to (0,4)
If the block dropped onto the cart while there was some KE would the energy still be conserved?
No. Momentum would be conserved in all cases though, so you'd analyze the new KE based on the momentum conservation
For part b, I did it differently to get the same answer. I basically said T = D/V, and found the v using conservation of energy, and said that the distance d is the same, finding an equation for time. T =1/f, and since i knew what time was, it was easy to find the frequencies, and I found f2/f1 to be 1/2. Is this correct?
How many points lost, do you think, if I drew the graph as a line from (0,1) to (1,0)?
Maybe 1 point? I don't know how the point allocation would be honestly.
@@AllenTsaoSTEMCoach probably 0 because all of the other steps were two points and it didn’t say to show work so it’s probably maximum 1 point
@@bitcoin-investment sounds right. I was saying maybe 1 point lost.
@@AllenTsaoSTEMCoach 👍
For part c-i I had a totally different answer but I think mine could plausibly also be right. I said that the 3m block multiplied the oscillating mass by 4 and, because the frequency ratio of 1/2 meant doubling the period, that the average velocity would be halved. Since 1/2(4m)(v/2)^2 = 1/2m(v)^2 I said that the kinetic energy would end up the same and therefore also potential energy since the law of conservation would still apply. Would this be a valid alternate answer and get full points?
na
i don’t understand why the frequency ratio is 1/2. i got 2 because i took the reciprocal of the periods
2pi(sqrt(m/k)) -> 1/2pi(sqrt(m/k))
The frequency is not 1/2pi(sqrt(m/k) but 1/2pi(sqrt(k/m))
Same
How many points do you think i lost if I put f1/f2 for part b?
Lmao same
For question c ii, do I have to explain how I got the graph, because I didn't put anything explanation but got the graph right (it didn't say I have to justify my answer in the question)
No, the scoring guidelines for anything that says "draw a line..." or "complete the graph..." are based on the graphed answer alone
Is the wall part of the system?
For which part?
From an energy point of it, it doesn't really matter if you include it because the wall doesn't do any work anyway (displacement is 0 for the wall's force)
Would you say the exam was harder/easier then last year
Easier on the multiple choice, harder on the free response
Harder on multiple choice, wayyy easier on free response 😭
@@smileyface8434 how you know about multiple choice?
@@bitcoin-investment i know i got everything wrong lol
Where did you find these? The website still only has 2022
apcentral.collegeboard.org/courses/ap-physics-1/exam
How many points do u think the graph at the end is? 2 points?
1
I sure hope it's only 1
@@awesomecodeyay8382 it's probably one each so 2
Part c severely messed me up. I was so confused how total mechsnical energy could possibly be the same. Because if you have more mass you will always have more kinetic energy. But i guess not in this case 😢
If you were to put 2/1 because of incorrect math is there still some sort of point? I forgot to do reciprocal
Possibly
Lmao I messwd it up so badly. First, I thought the block is 2m, second I forgot there is a sqaure root sign when I was simplifying. I ended up with 1/3
@@某中二且沙雕的闪电君 rip
depends if it is out of 2 points or 1 point
Would you get it wrong if when you made the graph you just did t^2 instead of 1/2t^2
No that would be correct. There's multiple ways to do linearization.
@@AllenTsaoSTEMCoach okay thanks for reviewing the AP questions you have been a big help ❤️
Wow I got most of these I’m feeling good for this test on may 17
Sir I just recalled that i took form I instead of form O. According to your experience do college board release form I as well or do they release form O only?
Only form O
@@spacix4118 got it. Thanks
Wish me luck
pray for me guys
Pray for me too my boy
Bro we are so cooked
We are dead, this was a mistake
@@itssoos2652 same 💀
B is 2/1