MJ16 P52 Q2 Paper 5 Tutorial | A2 Practical | CAIE A Level 9702 Physics
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- Опубліковано 30 лип 2024
- 9702/52/M/J/16: Tutorial on how to complete the written practical.
#9702s16p52 #A2inversePowerP5Q2 #Lv1
MJ16 P52 - FULL SOLVED past year.
Intro 0:00 - Easy vs Hard questions
Experiment intro 0:39 - Reading the question & Identifying constants
Linearizing 1:53 - determine expression of gradient
Table:
3:02 - completing the table - transfer of headers & prefixes
4:11 -finding absolute uncertainties for table values (Method 1: Identities)
12:13 - (Method 2: Max Min Values/half the range.)
15:18 - Comment on marking & errors.
plot graph & error bar
17:15 - DOUBLE CHECK your axes & comments on common errors.
18:36 - ODD scales??
19:11 - plotting begins? 1st reading.
19:53 - NO inbetween plots, how to round.
21:47 - First error bar drawing, BUT TOO SMALL.
23:34 - is there a problem??!
24:45 - corrected plot.
28:11 - second plot & error bar for 6th reading
Drawing Best Fit & Worse fit line
29:17 - Completed graphs - discussion about error bar.
30:18 - Best fit line - all points MUST be close, will not have anomalous.
30:38 - How to Worse fit line. [Worse fit line MUST pass ALL error bars]
Finding gradient and its uncertainty
31:36 - gradient
Calculations of resistivity, resistance & their uncertainties
33:56 - resistivity
36:00 - uncertainty in resistivity
36:38 - Resistance of new wire. & its uncertainty
How to: Written Practical | #A2physicsP5
• Paper 5 A2 Physics 970...
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This channel is just everything you need for your physics A level
I pray for the well-being of both these beautiful ladies. May Allah guide them❤
MAAAAANY THAAANKS FOR UR HELP
so touching for an excellent video
ma'am with all due respect, you are such a vibe!🤣❤
For gradient calculation, which traingle should be bigger between Best fit and Worst fit line?
For the first point on the graph, the error is +-0.03 but the error bar is on the whole box which is 0.2, can someone explain why
Thank you so much missssss
Ma'am, will there be a problem if I label the Best fit and Worst fit line in the grid of the graph? Or do I need to label them outside of the graph? 😯
hello, why did you calculate 𐤃p/p 15/100 in part (e) while calculating the uncertainty of resistivity? shouldn't it be like 0.15/1.12 ? and if I calculate with that value I got my absolute uncertainty as 27 +- 6 and can we write 27 +- 6.2 just for the sake of sf or will that be wrong?
15/100 is the percentage uncertainty in resistivity (15%= 0.15 as calculated in d(ii)
Where and how did you arrive at 0.15/1.12 is not the percentage uncertainty? It is the ratio of percentage uncertainty to the value of resistivity, which doesn't follow the identities of uncertainty
for final answers it is recommended to leave absolute uncertainty to 1sf and for the value to follow the decimal placing of absolute uncertainty.
ie: 27+/- 7
For more info, about these identities -
watch:
ua-cam.com/video/9mQSGuy0ugs/v-deo.html
Hello miss, I have two questions. 1. For the error bar uncertainty to we round up or down?
2. And for values of R and 1/d^2 , do we round up or down...or plot the exact value on the graph?
Thank you so much.
Values and uncertainties can be rounded up or down the the nearest box line.
19:47 :) LIFE ADVICE
Hello miss! My teacher said that you may get some points a bit distant from best fit line, and you can balance that by drawing the best fit line in between from those 'not touching line' points. She said some points may not touch the best fit line. I hope you understand what I'm saying. Is that correct?
Yes😊
hi miss, how did you calculate the uncertainty for the gradient? at 33:16
Find steepest/shallowest gradient from worst fit line, minus the best fit gradient!
I'm confused, should we make the absolute uncertainties to the same decimal places or sig figs? Because all of them here are to 2 sig figs except the first one and all are to 2 d.p. except the last one. Also, do we make them to the same sig figs/d.p. as the values of d or (1/d²)??
Thank you!
Significant figures and decimal places aren't the same thing, that's why there's two different terms to describe it. Decimal places means how many places after the decimal you have digits. Significant figures includes all the 'significant' numbers you have. Following this, 0 is not a significant number hence when discussing significant figures, we consider digits before zero only (not the same as decimal place! They taught this in third grade)
@brotherkurp8574 I know, that was not what I was asking about. In the table, they had some of the absolute uncertainties to the d.p. and some to the same sig figs.
example... 0.01/0.91 x 2 and after that did u multipy it by 1.21 and then what? i dont understand!!
u dont multiply it, u do 0.01/0.91 = ans^2 as in u take a square
miss! p4 was easy but the i feel like the curve will be high! my paper went well even thought i got stuck at one question ..... i did what i could in the time i could hehe. since i found this channel late. before finding this channel my concept was not good. ANYWAY miss, i have a question. when values like 9.7 or 13.9 or 6.93 , we can just take them like 10, 14 and 7 right? bc it was differently plotted for each of the values on your graph . so i was wondering if it do that will loose marks or not :((((
Just round those numbers to the nearest corner plot.
Miss, can we draw a dashed line for worst fit line or should we draw a normal line?
Do a normal line, but make sure to label which is best & worst fit!
@@ETphysics Thank you Miss!
Ma
I thought we were supposed draw circles over our point
Miss miss, can I use dots instead of crosses for plotting graph?
Crosses only, to be safe! Since the mark scheme says "no blobs"
@@ETphysics Thank you so much for replying! I know many UA-cam teachers that don't ever reply to confusion related questions, but you guys are just amazing. Thanks again!
Hey in Ciii) when finding the uncertainty you got 10^-6 answers for the B.F.L AND W.F.L but when subtracting the uncertainties you multiply it by 10^6 and not 10^-6
Is that a mistake? I dont understand😭
And the you have the final answer also as 10^6 but shouldn't it be multipied by 10^-6?
@@sarahakram3819 Well done! You spotted a mistake from my student that I didn't see myself.
You are right,
Gradient of the lines, AND its uncertainty AND its final answer should all have the prefix of 10^-6
Good job *thumbs up* keep learning and asking questions :)
@@ETphysics oh thank you so much
In Q2
Why do we take 10^6 in gradient . Shouldn’t we bring the denominator up so it becomes 10^-6
Plsss answer this . I have my boards tomorrow f m 2022
😭😭😭
hey why did you square (change in d /d)^2
That's not squared - that is multiplied by 2!
Oh thank you! Also on that note why’s it multiplied by 2? Thank you so much
Its multiplied by 2 because in the original formula d is to the power of 2! (Throwback to combining uncertainties in AS)
How do we calculate uncertainty when it’s not given in raw value?
If there’s multiple readings of a value (t1 and t2), then it will be (max value - min value)/2. Basically, the half of range.
BUT keep in mind that if they take the reading for 10 cycles for eg, then divide the final value by 10
@@peaceandloveonthisplanetea6564 THANK YOUUU
watch at 1:39:00 of their crash course vid, ua-cam.com/video/Y96u3bVE8Qc/v-deo.html
Highly recommend to not skip the crash course, lot of key info there
Hi ms, is it ok to fill in the table using pencil?
Nope, use pen! Only the graph page can use pencil to draw.
@@ETphysics noted ms , thank you so much for replying
Lmao I didn't know we could draw horizontal bars in such graphs
They can be horizontal or vertical, we gotta read the question carefully!
@@ETphysics it depends on the labelling on the axis right???
@@aroojniazi9726yup and the uncertainties given in the table, so follow the question!
@@ETphysicsWHAT HOW IS IT VERTICAL??
explain properly