i remember that the only question on the FRQs that had me stuck was the last part of this question - took me, like, 20 minutes to come up with that solution (at C, v = 0) and even then i wasnt sure about it
ARGH, I put that down for 1 c) but then I cross it out and change my answer to something stupid like The student forget to account from the amount of kenitic energy converting into pontential when it goes up the ramp from point B to C.
They don't care about relative lengths unless it explicitly says that you should draw them with the length related to the magnitude. So it would not matter for this one
Centripetal force is not a separate force on a free body diagram. The net force (total force) towards the center of the circle is the centripetal force. But it's not an extra force.
for b, is it ok if we put square root of 80R instead of square root of 8gR? i know the scoring guidelines haven’t released yet but idk from anyones thoughts would it be ok 😭😭
For d I derived the speed needed to detach off the track at point c and got sqrt(gR) then got the speed dropping it from 6R I realized after the test that it was from 4R and said its going too fast and would detach. Would I get any points for D?
@@JohnDoe-hf1zw oh i forgot about that part. If you got the fbd right then yes youll get that point. Depends on the scoring but youll def get atleast 1 pt on that part
I think it depends on how they score it. It could be just one point which you might not get, or they'd give you 1 point for setting 4mgR=½mv² and 1 for the answer. though, considering it's 7 points, I kinda predict it's just 1 point sadly
How do we know that there is a normal force for (c)i? How do we know it is going faster than the threshold to push it into the ramp? I believe at point c it could just have G acceleration and still stay in contact with Edit: the speed at that point is sqrt(4r) and the minimum speed is sqrt(10r) so the scenario is already impossible anyway
It's not impossible. The minimum speed it needs is sqrt(gR), and the speed at that point is sqrt(4gR) which is greater than sqrt(gR). I think you mistaken the speed by dropping your g (10) at some point.
@@AllenTsaoSTEMCoach Yes, I did forget that. I was doing it mentally. Thanks for the correction. Anyway, would there be a case that normal force is not included in the FBD but the block stays in contact?
@@asherwiggin6456 if it's in contact, there's always some normal force (otherwise it wouldn't be in contact). If the contact was very very weak, then the normal force could ALMOST be 0. But if there's any contact, there's a normal force.
Probably 1 point. Since it's only a fraction of c), I think it'll most likely be 1 point for mg force and correct direction, and another point for normal force and correct direction.
@@AllenTsaoSTEMCoach hi Allen, I am from Tokyo I wanted to know the whether college board release ap physics 1 international bcoz the students also required to practice those questions plus the questions college board releases they are easy , so international students also wants to know
@@AllenTsaoSTEMCoach thanks for the reply but the FrQ they post they sees easy so how the students get to know what kind of questions comes up and what they want for the right answer
The official practice tests or questions from AP classroom include versions from the international exam. You'll have to get your teacher to give you access
Yeah there's a U.S. exam and the International Exam. The international exam is tougher overall, but the scoring is more generous (lower threshold to get a 5 for example). And they never release the international exam FRQs unfortunately.
i remember that the only question on the FRQs that had me stuck was the last part of this question - took me, like, 20 minutes to come up with that solution (at C, v = 0) and even then i wasnt sure about it
ARGH, I put that down for 1 c) but then I cross it out and change my answer to something stupid like The student forget to account from the amount of kenitic energy converting into pontential when it goes up the ramp from point B to C.
same
I understood everything, but I hope I explained it well enough to get points
On the free body diagram, would the normal force have to be depicted as smaller than the force of gravity?
They don't care about relative lengths unless it explicitly says that you should draw them with the length related to the magnitude.
So it would not matter for this one
Would I still get some credit if I put sqrt10 gr instead of 8?
Shouldn’t there be centripetal force also towards the center?
Centripetal force is not a separate force on a free body diagram. The net force (total force) towards the center of the circle is the centripetal force. But it's not an extra force.
for b, is it ok if we put square root of 80R instead of square root of 8gR? i know the scoring guidelines haven’t released yet but idk from anyones thoughts would it be ok 😭😭
That would be fine
For d I derived the speed needed to detach off the track at point c and got sqrt(gR) then got the speed dropping it from 6R I realized after the test that it was from 4R and said its going too fast and would detach. Would I get any points for D?
No
@@Evan-kj6ye bruh idk what I was doing there how many points do you think this part would be since c is 2 parts? 2 points?
@@JohnDoe-hf1zw yes 2 or 3
@@Evan-kj6ye oh ok do you think I would at least get 1 point since for part 1 I got the FBD right?
@@JohnDoe-hf1zw oh i forgot about that part. If you got the fbd right then yes youll get that point. Depends on the scoring but youll def get atleast 1 pt on that part
what if I turn g into 10 instead of writing g in the equation？Cuz in the front of the test it said all g is cosnidered as 10m/s^2
i think you have to write g in derivations, not 100% sure tho
for part b i said v = sqrt 2g4R
would i still be correct?
yeah that's fine. They won't dock you for things like that.
I started off my equation. for velocity the same way you did but ended up with a pretty different result. do you think ill lose many points?
I think it depends on how they score it. It could be just one point which you might not get, or they'd give you 1 point for setting 4mgR=½mv² and 1 for the answer. though, considering it's 7 points, I kinda predict it's just 1 point sadly
How do we know that there is a normal force for (c)i? How do we know it is going faster than the threshold to push it into the ramp? I believe at point c it could just have G acceleration and still stay in contact with
Edit: the speed at that point is sqrt(4r) and the minimum speed is sqrt(10r) so the scenario is already impossible anyway
It's not impossible. The minimum speed it needs is sqrt(gR), and the speed at that point is sqrt(4gR) which is greater than sqrt(gR).
I think you mistaken the speed by dropping your g (10) at some point.
@@AllenTsaoSTEMCoach Yes, I did forget that. I was doing it mentally. Thanks for the correction. Anyway, would there be a case that normal force is not included in the FBD but the block stays in contact?
@@asherwiggin6456 if it's in contact, there's always some normal force (otherwise it wouldn't be in contact). If the contact was very very weak, then the normal force could ALMOST be 0. But if there's any contact, there's a normal force.
@@AllenTsaoSTEMCoach Thank you!
ugh, does an accidental negative under the root8gr ruin the whole thing, or just a point?
Dude how does that happen
Just a point at most.
For part c i if I didn’t draw the normal force how many point did I lose😢
L bro. We won't know until the point breakdown come out in the fall (after you get your score lol).
Probably 1 point. Since it's only a fraction of c), I think it'll most likely be 1 point for mg force and correct direction, and another point for normal force and correct direction.
why didn’t college board release the frqs that i had
There are always several forms of the exam. They only release 1 set every year (Form O)
@@AllenTsaoSTEMCoach hi Allen, I am from Tokyo I wanted to know the whether college board release ap physics 1 international bcoz the students also required to practice those questions plus the questions college board releases they are easy , so international students also wants to know
They do not release them
@@AllenTsaoSTEMCoach thanks for the reply but the FrQ they post they sees easy so how the students get to know what kind of questions comes up and what they want for the right answer
The official practice tests or questions from AP classroom include versions from the international exam. You'll have to get your teacher to give you access
i basically got all of c)ii wrong
Well I over thought the last question
damn what did u write then
@@audrey2498 nothing
I forgot normal force 😩
I'm cooked
Yessss 9/9
You so smart bro
It’s 7/7
oh I think this question is American exam not Asian… Truly different from our exam😮
Yeah there's a U.S. exam and the International Exam. The international exam is tougher overall, but the scoring is more generous (lower threshold to get a 5 for example).
And they never release the international exam FRQs unfortunately.